/*
 * Copyright 2004-2014 ICEsoft Technologies Canada Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS
 * IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

/*  Prototype JavaScript framework, version 1.7
 *  (c) 2005-2010 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {

    Version: '1.7',

    Browser: (function() {
        var ua = navigator.userAgent;
        var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
        return {
            IE:             !!window.attachEvent && !isOpera,
            Opera:          isOpera,
            WebKit:         ua.indexOf('AppleWebKit/') > -1,
            Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
            MobileSafari:   /Apple.*Mobile/.test(ua)
        }
    })(),

    BrowserFeatures: window.Prototype && window.Prototype.BrowserFeatures ? window.Prototype.BrowserFeatures : {
        XPath: !!document.evaluate,

        SelectorsAPI: !!document.querySelector,

        ElementExtensions: (function() {
            var constructor = window.Element || window.HTMLElement;
            return !!(constructor && constructor.prototype);
        })(),
        SpecificElementExtensions: (function() {
            if (typeof window.HTMLDivElement !== 'undefined')
                return true;

            var div = document.createElement('div'),
                    form = document.createElement('form'),
                    isSupported = false;

            if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
                isSupported = true;
            }

            div = form = null;

            return isSupported;
        })()
    },

    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

    emptyFunction: function() {
    },

    K: function(x) {
        return x
    }
};

//make public so Prototype reload can be detected
if (!window.Prototype) {
    window.Prototype = Prototype;
}


if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;


var Abstract = { };


var Try = {
    these: function() {
        var returnValue;

        for (var i = 0, length = arguments.length; i < length; i++) {
            var lambda = arguments[i];
            try {
                returnValue = lambda();
                break;
            } catch (e) {
            }
        }

        return returnValue;
    }
};

/* Based on Alex Arnell's inheritance implementation. */

var Class = (function() {

    var IS_DONTENUM_BUGGY = (function() {
        for (var p in { toString: 1 }) {
            if (p === 'toString') return false;
        }
        return true;
    })();

    function subclass() {
    }

    ;
    function create() {
        var parent = null, properties = $A(arguments);
        if (Object.isFunction(properties[0]))
            parent = properties.shift();

        function klass() {
            this.initialize.apply(this, arguments);
        }

        Object.extend(klass, Class.Methods);
        klass.superclass = parent;
        klass.subclasses = [];

        if (parent) {
            subclass.prototype = parent.prototype;
            klass.prototype = new subclass;
            parent.subclasses.push(klass);
        }

        for (var i = 0, length = properties.length; i < length; i++)
            klass.addMethods(properties[i]);

        if (!klass.prototype.initialize)
            klass.prototype.initialize = Prototype.emptyFunction;

        klass.prototype.constructor = klass;
        return klass;
    }

    function addMethods(source) {
        var ancestor = this.superclass && this.superclass.prototype,
                properties = Object.keys(source);

        if (IS_DONTENUM_BUGGY) {
            if (source.toString != Object.prototype.toString)
                properties.push("toString");
            if (source.valueOf != Object.prototype.valueOf)
                properties.push("valueOf");
        }

        for (var i = 0, length = properties.length; i < length; i++) {
            var property = properties[i], value = source[property];
            if (ancestor && Object.isFunction(value) &&
                    value.argumentNames()[0] == "$super") {
                var method = value;
                value = (function(m) {
                    return function() {
                        return ancestor[m].apply(this, arguments);
                    };
                })(property).wrap(method);

                value.valueOf = method.valueOf.bind(method);
                value.toString = method.toString.bind(method);
            }
            this.prototype[property] = value;
        }

        return this;
    }

    return {
        create: create,
        Methods: {
            addMethods: addMethods
        }
    };
})();
(function() {

    var _toString = Object.prototype.toString,
            NULL_TYPE = 'Null',
            UNDEFINED_TYPE = 'Undefined',
            BOOLEAN_TYPE = 'Boolean',
            NUMBER_TYPE = 'Number',
            STRING_TYPE = 'String',
            OBJECT_TYPE = 'Object',
            FUNCTION_CLASS = '[object Function]',
            BOOLEAN_CLASS = '[object Boolean]',
            NUMBER_CLASS = '[object Number]',
            STRING_CLASS = '[object String]',
            ARRAY_CLASS = '[object Array]',
            DATE_CLASS = '[object Date]',
            NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
                    typeof JSON.stringify === 'function' &&
                    JSON.stringify(0) === '0' &&
                    typeof JSON.stringify(Prototype.K) === 'undefined';

    function Type(o) {
        switch (o) {
            case null: return NULL_TYPE;
            case (void 0): return UNDEFINED_TYPE;
        }
        var type = typeof o;
        switch (type) {
            case 'boolean': return BOOLEAN_TYPE;
            case 'number':  return NUMBER_TYPE;
            case 'string':  return STRING_TYPE;
        }
        return OBJECT_TYPE;
    }

    function extend(destination, source) {
        for (var property in source)
            destination[property] = source[property];
        return destination;
    }

    function inspect(object) {
        try {
            if (isUndefined(object)) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : String(object);
        } catch (e) {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    }

    function toJSON(value) {
        return Str('', { '': value }, []);
    }

    function Str(key, holder, stack) {
        var value = holder[key],
                type = typeof value;

        if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
            value = value.toJSON(key);
        }

        var _class = _toString.call(value);

        switch (_class) {
            case NUMBER_CLASS:
            case BOOLEAN_CLASS:
            case STRING_CLASS:
                value = value.valueOf();
        }

        switch (value) {
            case null: return 'null';
            case true: return 'true';
            case false: return 'false';
        }

        type = typeof value;
        switch (type) {
            case 'string':
                return value.inspect(true);
            case 'number':
                return isFinite(value) ? String(value) : 'null';
            case 'object':

                for (var i = 0, length = stack.length; i < length; i++) {
                    if (stack[i] === value) {
                        throw new TypeError();
                    }
                }
                stack.push(value);

                var partial = [];
                if (_class === ARRAY_CLASS) {
                    for (var i = 0, length = value.length; i < length; i++) {
                        var str = Str(i, value, stack);
                        partial.push(typeof str === 'undefined' ? 'null' : str);
                    }
                    partial = '[' + partial.join(',') + ']';
                } else {
                    var keys = Object.keys(value);
                    for (var i = 0, length = keys.length; i < length; i++) {
                        var key = keys[i], str = Str(key, value, stack);
                        if (typeof str !== "undefined") {
                            partial.push(key.inspect(true) + ':' + str);
                        }
                    }
                    partial = '{' + partial.join(',') + '}';
                }
                stack.pop();
                return partial;
        }
    }

    function stringify(object) {
        return JSON.stringify(object);
    }

    function toQueryString(object) {
        return $H(object).toQueryString();
    }

    function toHTML(object) {
        return object && object.toHTML ? object.toHTML() : String.interpret(object);
    }

    function keys(object) {
        if (Type(object) !== OBJECT_TYPE) {
            throw new TypeError();
        }
        var results = [];
        for (var property in object) {
            if (object.hasOwnProperty(property)) {
                results.push(property);
            }
        }
        return results;
    }

    function values(object) {
        var results = [];
        for (var property in object)
            results.push(object[property]);
        return results;
    }

    function clone(object) {
        return extend({ }, object);
    }

    function isElement(object) {
        return !!(object && object.nodeType == 1);
    }

    function isArray(object) {
        return _toString.call(object) === ARRAY_CLASS;
    }

    var hasNativeIsArray = (typeof Array.isArray == 'function')
            && Array.isArray([]) && !Array.isArray({});

    if (hasNativeIsArray) {
        isArray = Array.isArray;
    }

    function isHash(object) {
        return object instanceof Hashtable;
    }

    function isFunction(object) {
        return _toString.call(object) === FUNCTION_CLASS;
    }

    function isString(object) {
        return _toString.call(object) === STRING_CLASS;
    }

    function isNumber(object) {
        return _toString.call(object) === NUMBER_CLASS;
    }

    function isDate(object) {
        return _toString.call(object) === DATE_CLASS;
    }

    function isUndefined(object) {
        return typeof object === "undefined";
    }

    extend(Object, {
        extend:        extend,
        inspect:       inspect,
        toJSON:        NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
        toQueryString: toQueryString,
        toHTML:        toHTML,
        keys:          Object.keys || keys,
        values:        values,
        clone:         clone,
        isElement:     isElement,
        isArray:       isArray,
        isHash:        isHash,
        isFunction:    isFunction,
        isString:      isString,
        isNumber:      isNumber,
        isDate:        isDate,
        isUndefined:   isUndefined
    });
})();
Object.extend(Function.prototype, (function() {
    var slice = Array.prototype.slice;

    function update(array, args) {
        var arrayLength = array.length, length = args.length;
        while (length--) array[arrayLength + length] = args[length];
        return array;
    }

    function merge(array, args) {
        array = slice.call(array, 0);
        return update(array, args);
    }

    function argumentNames() {
        var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
                .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
                .replace(/\s+/g, '').split(',');
        return names.length == 1 && !names[0] ? [] : names;
    }

    function bind(context) {
        if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
        var __method = this, args = slice.call(arguments, 1);
        return function() {
            var a = merge(args, arguments);
            return __method.apply(context, a);
        }
    }

    function bindAsEventListener(context) {
        var __method = this, args = slice.call(arguments, 1);
        return function(event) {
            var a = update([event || window.event], args);
            return __method.apply(context, a);
        }
    }

    function curry() {
        if (!arguments.length) return this;
        var __method = this, args = slice.call(arguments, 0);
        return function() {
            var a = merge(args, arguments);
            return __method.apply(this, a);
        }
    }

    function delay(timeout) {
        var __method = this, args = slice.call(arguments, 1);
        timeout = timeout * 1000;
        return window.setTimeout(function() {
            return __method.apply(__method, args);
        }, timeout);
    }

    function defer() {
        var args = update([0.01], arguments);
        return this.delay.apply(this, args);
    }

    function wrap(wrapper) {
        var __method = this;
        return function() {
            var a = update([__method.bind(this)], arguments);
            return wrapper.apply(this, a);
        }
    }

    function methodize() {
        if (this._methodized) return this._methodized;
        var __method = this;
        return this._methodized = function() {
            var a = update([this], arguments);
            return __method.apply(null, a);
        };
    }

    return {
        argumentNames:       argumentNames,
        bind:                bind,
        bindAsEventListener: bindAsEventListener,
        curry:               curry,
        delay:               delay,
        defer:               defer,
        wrap:                wrap,
        methodize:           methodize
    }
})());


(function(proto) {


    function toISOString() {
        return this.getUTCFullYear() + '-' +
                (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
                this.getUTCDate().toPaddedString(2) + 'T' +
                this.getUTCHours().toPaddedString(2) + ':' +
                this.getUTCMinutes().toPaddedString(2) + ':' +
                this.getUTCSeconds().toPaddedString(2) + 'Z';
    }


    function toJSON() {
        return this.toISOString();
    }

    if (!proto.toISOString) proto.toISOString = toISOString;
    if (!proto.toJSON) proto.toJSON = toJSON;

})(Date.prototype);


RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency) {
        this.callback = callback;
        this.frequency = frequency;
        this.currentlyExecuting = false;

        this.registerCallback();
    },

    registerCallback: function() {
        this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },

    execute: function() {
        this.callback(this);
    },

    stop: function() {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },

    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.execute();
                this.currentlyExecuting = false;
            } catch(e) {
                this.currentlyExecuting = false;
                throw e;
            }
        }
    }
});
Object.extend(String, {
    interpret: function(value) {
        return value == null ? '' : String(value);
    },
    specialChar: {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '\\': '\\\\'
    }
});

Object.extend(String.prototype, (function() {
    var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
            typeof JSON.parse === 'function' &&
            JSON.parse('{"test": true}').test;

    function prepareReplacement(replacement) {
        if (Object.isFunction(replacement)) return replacement;
        var template = new Template(replacement);
        return function(match) {
            return template.evaluate(match)
        };
    }

    function gsub(pattern, replacement) {
        var result = '', source = this, match;
        replacement = prepareReplacement(replacement);

        if (Object.isString(pattern))
            pattern = RegExp.escape(pattern);

        if (!(pattern.length || pattern.source)) {
            replacement = replacement('');
            return replacement + source.split('').join(replacement) + replacement;
        }

        while (source.length > 0) {
            if (match = source.match(pattern)) {
                result += source.slice(0, match.index);
                result += String.interpret(replacement(match));
                source = source.slice(match.index + match[0].length);
            } else {
                result += source,source = '';
            }
        }
        return result;
    }

    function sub(pattern, replacement, count) {
        replacement = prepareReplacement(replacement);
        count = Object.isUndefined(count) ? 1 : count;

        return this.gsub(pattern, function(match) {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    }

    function scan(pattern, iterator) {
        this.gsub(pattern, iterator);
        return String(this);
    }

    function truncate(length, truncation) {
        length = length || 30;
        truncation = Object.isUndefined(truncation) ? '...' : truncation;
        return this.length > length ?
                this.slice(0, length - truncation.length) + truncation : String(this);
    }

    function strip() {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    }

    function stripTags() {
        return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
    }

    function stripScripts() {
        return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    }

    function extractScripts() {
        var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
                matchOne = new RegExp(Prototype.ScriptFragment, 'im');
        return (this.match(matchAll) || []).mapWith(function(scriptTag) {
            return (scriptTag.match(matchOne) || ['', ''])[1];
        });
    }

    function evalScripts() {
        return this.extractScripts().mapWith(function(script) {
            return eval(script)
        });
    }

    function escapeHTML() {
        return this.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    }

    function unescapeHTML() {
        return this.stripTags().replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&amp;/g, '&');
    }


    function toQueryParams(separator) {
        var match = this.strip().match(/([^?#]*)(#.*)?$/);
        if (!match) return { };

        return match[1].split(separator || '&').inject({ }, function(hash, pair) {
            if ((pair = pair.split('='))[0]) {
                var key = decodeURIComponent(pair.shift()),
                        value = pair.length > 1 ? pair.join('=') : pair[0];

                if (value != undefined) value = decodeURIComponent(value);

                if (key in hash) {
                    if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                    hash[key].push(value);
                }
                else hash[key] = value;
            }
            return hash;
        });
    }

    function toArray() {
        return this.split('');
    }

    function succ() {
        return this.slice(0, this.length - 1) +
                String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    }

    function times(count) {
        return count < 1 ? '' : new Array(count + 1).join(this);
    }

    function camelize() {
        return this.replace(/-+(.)?/g, function(match, chr) {
            return chr ? chr.toUpperCase() : '';
        });
    }

    function capitalize() {
        return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    }

    function underscore() {
        return this.replace(/::/g, '/')
                .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
                .replace(/([a-z\d])([A-Z])/g, '$1_$2')
                .replace(/-/g, '_')
                .toLowerCase();
    }

    function dasherize() {
        return this.replace(/_/g, '-');
    }

    function inspect(useDoubleQuotes) {
        var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
            if (character in String.specialChar) {
                return String.specialChar[character];
            }
            return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
        });
        if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
        return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    }

    function unfilterJSON(filter) {
        return this.replace(filter || Prototype.JSONFilter, '$1');
    }

    function isJSON() {
        var str = this;
        if (str.blank()) return false;
        str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
        str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
        str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
        return (/^[\],:{}\s]*$/).test(str);
    }

    function evalJSON(sanitize) {
        var json = this.unfilterJSON(),
                cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
        if (cx.test(json)) {
            json = json.replace(cx, function (a) {
                return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
            });
        }
        try {
            if (!sanitize || json.isJSON()) return eval('(' + json + ')');
        } catch (e) {
        }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    }

    function parseJSON() {
        var json = this.unfilterJSON();
        return JSON.parse(json);
    }

    function include(pattern) {
        return this.indexOf(pattern) > -1;
    }

    function startsWith(pattern) {
        return this.lastIndexOf(pattern, 0) === 0;
    }

    function endsWith(pattern) {
        var d = this.length - pattern.length;
        return d >= 0 && this.indexOf(pattern, d) === d;
    }

    function empty() {
        return this == '';
    }

    function blank() {
        return /^\s*$/.test(this);
    }

    function interpolate(object, pattern) {
        return new Template(this, pattern).evaluate(object);
    }

    return {
        gsub:           gsub,
        sub:            sub,
        scan:           scan,
        truncate:       truncate,
        strip:          String.prototype.trim || strip,
        stripTags:      stripTags,
        stripScripts:   stripScripts,
        extractScripts: extractScripts,
        evalScripts:    evalScripts,
        escapeHTML:     escapeHTML,
        unescapeHTML:   unescapeHTML,
        toQueryParams:  toQueryParams,
        parseQuery:     toQueryParams,
        toArray:        toArray,
        succ:           succ,
        times:          times,
        camelize:       camelize,
        capitalize:     capitalize,
        underscore:     underscore,
        dasherize:      dasherize,
        inspect:        inspect,
        unfilterJSON:   unfilterJSON,
        isJSON:         isJSON,
        evalJSON:       NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
        include:        include,
        startsWith:     startsWith,
        endsWith:       endsWith,
        empty:          empty,
        blank:          blank,
        interpolate:    interpolate
    };
})());

var Template = Class.create({
    initialize: function(template, pattern) {
        this.template = template.toString();
        this.pattern = pattern || Template.Pattern;
    },

    evaluate: function(object) {
        if (object && Object.isFunction(object.toTemplateReplacements))
            object = object.toTemplateReplacements();

        return this.template.gsub(this.pattern, function(match) {
            if (object == null) return (match[1] + '');

            var before = match[1] || '';
            if (before == '\\') return match[2];

            var ctx = object, expr = match[3],
                    pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;

            match = pattern.exec(expr);
            if (match == null) return before;

            while (match != null) {
                var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
                ctx = ctx[comp];
                if (null == ctx || '' == match[3]) break;
                expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
                match = pattern.exec(expr);
            }

            return before + String.interpret(ctx);
        });
    }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = (function() {
    function each(iterator, context) {
        var index = 0;
        try {
            this._each(function(value) {
                iterator.call(context, value, index++);
            });
        } catch (e) {
            if (e != $break) throw e;
        }
        return this;
    }

    function eachSlice(number, iterator, context) {
        var index = -number, slices = [], array = this.toArray();
        if (number < 1) return array;
        while ((index += number) < array.length)
            slices.push(array.slice(index, index + number));
        return slices.collectWith(iterator, context);
    }

    function all(iterator, context) {
        iterator = iterator || Prototype.K;
        var result = true;
        this.each(function(value, index) {
            result = result && !!iterator.call(context, value, index);
            if (!result) throw $break;
        });
        return result;
    }

    function any(iterator, context) {
        iterator = iterator || Prototype.K;
        var result = false;
        this.each(function(value, index) {
            if (result = !!iterator.call(context, value, index))
                throw $break;
        });
        return result;
    }

    function collect(iterator, context) {
        iterator = iterator || Prototype.K;
        var results = [];
        this.each(function(value, index) {
            results.push(iterator.call(context, value, index));
        });
        return results;
    }

    function detect(iterator, context) {
        var result;
        this.each(function(value, index) {
            if (iterator.call(context, value, index)) {
                result = value;
                throw $break;
            }
        });
        return result;
    }

    function findAll(iterator, context) {
        var results = [];
        this.each(function(value, index) {
            if (iterator.call(context, value, index))
                results.push(value);
        });
        return results;
    }

    function grep(filter, iterator, context) {
        iterator = iterator || Prototype.K;
        var results = [];

        if (Object.isString(filter))
            filter = new RegExp(RegExp.escape(filter));

        this.each(function(value, index) {
            if (filter.match(value))
                results.push(iterator.call(context, value, index));
        });
        return results;
    }

    function include(object) {
        if (Object.isFunction(this.indexOf))
            if (this.indexOf(object) != -1) return true;

        var found = false;
        this.each(function(value) {
            if (value == object) {
                found = true;
                throw $break;
            }
        });
        return found;
    }

    function inGroupsOf(number, fillWith) {
        fillWith = Object.isUndefined(fillWith) ? null : fillWith;
        return this.eachSlice(number, function(slice) {
            while (slice.length < number) slice.push(fillWith);
            return slice;
        });
    }

    function inject(memo, iterator, context) {
        this.each(function(value, index) {
            memo = iterator.call(context, memo, value, index);
        });
        return memo;
    }

    function invoke(method) {
        var args = $A(arguments).slice(1);
        return this.mapWith(function(value) {
            return value[method].apply(value, args);
        });
    }

    function max(iterator, context) {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator.call(context, value, index);
            if (result == null || value >= result)
                result = value;
        });
        return result;
    }

    function min(iterator, context) {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator.call(context, value, index);
            if (result == null || value < result)
                result = value;
        });
        return result;
    }

    function partition(iterator, context) {
        iterator = iterator || Prototype.K;
        var trues = [], falses = [];
        this.each(function(value, index) {
            (iterator.call(context, value, index) ?
                    trues : falses).push(value);
        });
        return [trues, falses];
    }

    function pluck(property) {
        var results = [];
        this.each(function(value) {
            results.push(value[property]);
        });
        return results;
    }

    function reject(iterator, context) {
        var results = [];
        this.each(function(value, index) {
            if (!iterator.call(context, value, index))
                results.push(value);
        });
        return results;
    }

    function sortBy(iterator, context) {
        return this.mapWith(
                function(value, index) {
                    return {
                        value: value,
                        criteria: iterator.call(context, value, index)
                    };
                }).sort(
                function(left, right) {
                    var a = left.criteria, b = right.criteria;
                    return a < b ? -1 : a > b ? 1 : 0;
                }).pluck('value');
    }

    function toArray() {
        return this.mapWith();
    }

    function zip() {
        var iterator = Prototype.K, args = $A(arguments);
        if (Object.isFunction(args.last()))
            iterator = args.pop();

        var collections = [this].concat(args).mapWith($A);
        return this.mapWith(function(value, index) {
            return iterator(collections.pluck(index));
        });
    }

    function size() {
        return this.toArray().length;
    }

    function inspect() {
        return '#<Enumerable:' + this.toArray().inspect() + '>';
    }


    return {
        each:       each,
        eachSlice:  eachSlice,
        all:        all,
        every:      all,
        any:        any,
        some:       any,
        collectWith:collect,
        mapWith:    collect,
        detect:     detect,
        findAll:    findAll,
        select:     findAll,
        filter:     findAll,
        grep:       grep,
        include:    include,
        member:     include,
        inGroupsOf: inGroupsOf,
        inject:     inject,
        invoke:     invoke,
        max:        max,
        min:        min,
        partition:  partition,
        pluck:      pluck,
        reject:     reject,
        sortBy:     sortBy,
        toArray:    toArray,
        entries:    toArray,
        zip:        zip,
        size:       size,
        inspect:    inspect,
        find:       detect
    };
})();

function $A(iterable) {
    if (!iterable) return [];
    if ('toArray' in Object(iterable)) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
}


function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}

Array.from = $A;


(function() {
    var arrayProto = Array.prototype,
            slice = arrayProto.slice,
            _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available

    function each(iterator, context) {
        for (var i = 0, length = this.length >>> 0; i < length; i++) {
            if (i in this) iterator.call(context, this[i], i, this);
        }
    }

    if (!_each) _each = each;

    function clear() {
        this.length = 0;
        return this;
    }

    function first() {
        return this[0];
    }

    function last() {
        return this[this.length - 1];
    }

    function compact() {
        return this.select(function(value) {
            return value != null;
        });
    }

    function flatten() {
        return this.inject([], function(array, value) {
            if (Object.isArray(value))
                return array.concat(value.flatten());
            array.push(value);
            return array;
        });
    }

    function without() {
        var values = slice.call(arguments, 0);
        return this.select(function(value) {
            return !values.include(value);
        });
    }

    function reverse(inline) {
        return (inline === false ? this.toArray() : this)._reverse();
    }

    function uniq(sorted) {
        return this.inject([], function(array, value, index) {
            if (0 == index || (sorted ? array.last() != value : !array.include(value)))
                array.push(value);
            return array;
        });
    }

    function intersect(array) {
        return this.uniq().findAll(function(item) {
            return array.detect(function(value) {
                return item === value
            });
        });
    }


    function clone() {
        return slice.call(this, 0);
    }

    function size() {
        return this.length;
    }

    function inspect() {
        return '[' + this.mapWith(Object.inspect).join(', ') + ']';
    }

    function indexOf(item, i) {
        i || (i = 0);
        var length = this.length;
        if (i < 0) i = length + i;
        for (; i < length; i++)
            if (this[i] === item) return i;
        return -1;
    }

    function lastIndexOf(item, i) {
        i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
        var n = this.slice(0, i).reverse().indexOf(item);
        return (n < 0) ? n : i - n - 1;
    }

    function concat() {
        var array = slice.call(this, 0), item;
        for (var i = 0, length = arguments.length; i < length; i++) {
            item = arguments[i];
            if (Object.isArray(item) && !('callee' in item)) {
                for (var j = 0, arrayLength = item.length; j < arrayLength; j++)
                    array.push(item[j]);
            } else {
                array.push(item);
            }
        }
        return array;
    }

    Object.extend(arrayProto, Enumerable);

    if (!arrayProto._reverse)
        arrayProto._reverse = arrayProto.reverse;

    Object.extend(arrayProto, {
        _each:     _each,
        clear:     clear,
        first:     first,
        last:      last,
        compact:   compact,
        flatten:   flatten,
        without:   without,
        reverse:   reverse,
        uniq:      uniq,
        intersect: intersect,
        clone:     clone,
        toArray:   clone,
        size:      size,
        inspect:   inspect
    });

    var CONCAT_ARGUMENTS_BUGGY = (function() {
        return [].concat(arguments)[0][0] !== 1;
    })(1, 2)

    if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;

    if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
    if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
})();

function $H(object) {
    return new Hashtable(object);
}

var Hashtable = Class.create(Enumerable, (function() {
    function initialize(object) {
        this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    }


    function _each(iterator) {
        for (var key in this._object) {
            var value = this._object[key], pair = [key, value];
            pair.key = key;
            pair.value = value;
            iterator(pair);
        }
    }

    function set(key, value) {
        return this._object[key] = value;
    }

    function get(key) {
        if (this._object[key] !== Object.prototype[key])
            return this._object[key];
    }

    function unset(key) {
        var value = this._object[key];
        delete this._object[key];
        return value;
    }

    function toObject() {
        return Object.clone(this._object);
    }


    function keys() {
        return this.pluck('key');
    }

    function values() {
        return this.pluck('value');
    }

    function index(value) {
        var match = this.detect(function(pair) {
            return pair.value === value;
        });
        return match && match.key;
    }

    function merge(object) {
        return this.clone().update(object);
    }

    function update(object) {
        return new Hashtable(object).inject(this, function(result, pair) {
            result.set(pair.key, pair.value);
            return result;
        });
    }

    function toQueryPair(key, value) {
        if (Object.isUndefined(value)) return key;
        return key + '=' + encodeURIComponent(String.interpret(value));
    }

    function toQueryString() {
        return this.inject([],
                function(results, pair) {
                    var key = encodeURIComponent(pair.key), values = pair.value;

                    if (values && typeof values == 'object') {
                        if (Object.isArray(values)) {
                            var queryValues = [];
                            for (var i = 0, len = values.length, value; i < len; i++) {
                                value = values[i];
                                queryValues.push(toQueryPair(key, value));
                            }
                            return results.concat(queryValues);
                        }
                    } else results.push(toQueryPair(key, values));
                    return results;
                }).join('&');
    }

    function inspect() {
        return '#<Hash:{' + this.mapWith(
                function(pair) {
                    return pair.mapWith(Object.inspect).join(': ');
                }).join(', ') + '}>';
    }

    function clone() {
        return new Hashtable(this);
    }

    return {
        initialize:             initialize,
        _each:                  _each,
        set:                    set,
        get:                    get,
        unset:                  unset,
        toObject:               toObject,
        toTemplateReplacements: toObject,
        keys:                   keys,
        values:                 values,
        index:                  index,
        merge:                  merge,
        update:                 update,
        toQueryString:          toQueryString,
        inspect:                inspect,
        toJSON:                 toObject,
        clone:                  clone
    };
})());

Hashtable.from = $H;
Object.extend(Number.prototype, (function() {
    function toColorPart() {
        return this.toPaddedString(2, 16);
    }

    function succ() {
        return this + 1;
    }

    function times(iterator, context) {
        $R(0, this, true).each(iterator, context);
        return this;
    }

    function toPaddedString(length, radix) {
        var string = this.toString(radix || 10);
        return '0'.times(length - string.length) + string;
    }

    function abs() {
        return Math.abs(this);
    }

    function round() {
        return Math.round(this);
    }

    function ceil() {
        return Math.ceil(this);
    }

    function floor() {
        return Math.floor(this);
    }

    return {
        toColorPart:    toColorPart,
        succ:           succ,
        times:          times,
        toPaddedString: toPaddedString,
        abs:            abs,
        round:          round,
        ceil:           ceil,
        floor:          floor
    };
})());

function $R(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
}

var ObjectRange = Class.create(Enumerable, (function() {
    function initialize(start, end, exclusive) {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    }

    function _each(iterator) {
        var value = this.start;
        while (this.include(value)) {
            iterator(value);
            value = value.succ();
        }
    }

    function include(value) {
        if (value < this.start)
            return false;
        if (this.exclusive)
            return value < this.end;
        return value <= this.end;
    }

    return {
        initialize: initialize,
        _each:      _each,
        include:    include
    };
})());


var Ajax = {
    getTransport: function() {
        return Try.these(
                function() {
                    return new XMLHttpRequest()
                },
                function() {
                    return new ActiveXObject('MSXML2.XMLHTTP.6.0')
                },
                function() {
                    return new ActiveXObject('Microsoft.XMLHTTP')
                }
                ) || false;
    },

    activeRequestCount: 0
};

Ajax.Responders = {
    responders: [],

    _each: function(iterator) {
        this.responders._each(iterator);
    },

    register: function(responder) {
        if (!this.include(responder))
            this.responders.push(responder);
    },

    unregister: function(responder) {
        this.responders = this.responders.without(responder);
    },

    dispatch: function(callback, request, transport, json) {
        this.each(function(responder) {
            if (Object.isFunction(responder[callback])) {
                try {
                    responder[callback].apply(responder, [request, transport, json]);
                } catch (e) {
                }
            }
        });
    }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
    onCreate:   function() {
        Ajax.activeRequestCount++
    },
    onComplete: function() {
        Ajax.activeRequestCount--
    }
});
Ajax.Base = Class.create({
    initialize: function(options) {
        this.options = {
            method:       'post',
            asynchronous: true,
            contentType:  'application/x-www-form-urlencoded',
            encoding:     'UTF-8',
            parameters:   '',
            evalJSON:     true,
            evalJS:       true
        };
        Object.extend(this.options, options || { });

        this.options.method = this.options.method.toLowerCase();

        if (Object.isHash(this.options.parameters))
            this.options.parameters = this.options.parameters.toObject();
    }
});
Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,

    initialize: function($super, url, options) {
        $super(options);
        this.transport = Ajax.getTransport();
        this.request(url);
    },

    request: function(url) {
        this.url = url;
        this.method = this.options.method;
        var params = Object.isString(this.options.parameters) ?
                this.options.parameters :
                Object.toQueryString(this.options.parameters);

        if (!['get', 'post'].include(this.method)) {
            params += (params ? '&' : '') + "_method=" + this.method;
            this.method = 'post';
        }

        if (params && this.method === 'get') {
            this.url += (this.url.include('?') ? '&' : '?') + params;
        }

        this.parameters = params.toQueryParams();

        try {
            var response = new Ajax.Response(this);
            if (this.options.onCreate) this.options.onCreate(response);
            Ajax.Responders.dispatch('onCreate', this, response);

            this.transport.open(this.method.toUpperCase(), this.url,
                    this.options.asynchronous);

            if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();

            this.body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(this.body);

            /* Force Firefox to handle ready state 4 for synchronous requests */
            if (!this.options.asynchronous && this.transport.overrideMimeType)
                this.onStateChange();

        }
        catch (e) {
            this.dispatchException(e);
        }
    },

    onStateChange: function() {
        var readyState = this.transport.readyState;
        if (readyState > 1 && !((readyState == 4) && this._complete))
            this.respondToReadyState(this.transport.readyState);
    },

    setRequestHeaders: function() {
        var headers = {
            'X-Requested-With': 'XMLHttpRequest',
            'X-Prototype-Version': Prototype.Version,
            'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
        };

        if (this.method == 'post') {
            headers['Content-type'] = this.options.contentType +
                    (this.options.encoding ? '; charset=' + this.options.encoding : '');

            /* Force "Connection: close" for older Mozilla browsers to work
             * around a bug where XMLHttpRequest sends an incorrect
             * Content-length header. See Mozilla Bugzilla #246651.
             */
            if (this.transport.overrideMimeType &&
                    (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
                headers['Connection'] = 'close';
        }

        if (typeof this.options.requestHeaders == 'object') {
            var extras = this.options.requestHeaders;

            if (Object.isFunction(extras.push))
                for (var i = 0, length = extras.length; i < length; i += 2)
                    headers[extras[i]] = extras[i + 1];
            else
                $H(extras).each(function(pair) {
                    headers[pair.key] = pair.value
                });
        }

        for (var name in headers)
            this.transport.setRequestHeader(name, headers[name]);
    },

    success: function() {
        var status = this.getStatus();
        return !status || (status >= 200 && status < 300) || status == 304;
    },

    getStatus: function() {
        try {
            if (this.transport.status === 1223) return 204;
            return this.transport.status || 0;
        } catch (e) {
            return 0
        }
    },

    respondToReadyState: function(readyState) {
        var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

        if (state == 'Complete') {
            try {
                this._complete = true;
                (this.options['on' + response.status]
                        || this.options['on' + (this.success() ? 'Success' : 'Failure')]
                        || Prototype.emptyFunction)(response, response.headerJSON);
            } catch (e) {
                this.dispatchException(e);
            }

            var contentType = response.getHeader('Content-type');
            if (this.options.evalJS == 'force'
                    || (this.options.evalJS && this.isSameOrigin() && contentType
                    && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
                this.evalResponse();
        }

        try {
            (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
            Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
        } catch (e) {
            this.dispatchException(e);
        }

        if (state == 'Complete') {
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },

    isSameOrigin: function() {
        var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
        return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
            protocol: location.protocol,
            domain: document.domain,
            port: location.port ? ':' + location.port : ''
        }));
    },

    getHeader: function(name) {
        try {
            return this.transport.getResponseHeader(name) || null;
        } catch (e) {
            return null;
        }
    },

    evalResponse: function() {
        try {
            return eval((this.transport.responseText || '').unfilterJSON());
        } catch (e) {
            this.dispatchException(e);
        }
    },

    dispatchException: function(exception) {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});

Ajax.Request.Events =
        ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];


Ajax.Response = Class.create({
    initialize: function(request) {
        this.request = request;
        var transport = this.transport = request.transport,
                readyState = this.readyState = transport.readyState;

        if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
            this.status = this.getStatus();
            this.statusText = this.getStatusText();
            this.responseText = String.interpret(transport.responseText);
            this.headerJSON = this._getHeaderJSON();
        }

        if (readyState == 4) {
            var xml = transport.responseXML;
            this.responseXML = Object.isUndefined(xml) ? null : xml;
            this.responseJSON = this._getResponseJSON();
        }
    },

    status:      0,

    statusText: '',

    getStatus: Ajax.Request.prototype.getStatus,

    getStatusText: function() {
        try {
            return this.transport.statusText || '';
        } catch (e) {
            return ''
        }
    },

    getHeader: Ajax.Request.prototype.getHeader,

    getAllHeaders: function() {
        try {
            return this.getAllResponseHeaders();
        } catch (e) {
            return null
        }
    },

    getResponseHeader: function(name) {
        return this.transport.getResponseHeader(name);
    },

    getAllResponseHeaders: function() {
        return this.transport.getAllResponseHeaders();
    },

    _getHeaderJSON: function() {
        var json = this.getHeader('X-JSON');
        if (!json) return null;
        json = decodeURIComponent(escape(json));
        try {
            return json.evalJSON(this.request.options.sanitizeJSON ||
                    !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    },

    _getResponseJSON: function() {
        var options = this.request.options;
        if (!options.evalJSON || (options.evalJSON != 'force' &&
                !(this.getHeader('Content-type') || '').include('application/json')) ||
                this.responseText.blank())
            return null;
        try {
            return this.responseText.evalJSON(options.sanitizeJSON ||
                    !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    }
});

Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options) {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        };

        options = Object.clone(options);
        var onComplete = options.onComplete;
        options.onComplete = (function(response, json) {
            this.updateContent(response.responseText);
            if (Object.isFunction(onComplete)) onComplete(response, json);
        }).bind(this);

        $super(url, options);
    },

    updateContent: function(responseText) {
        var receiver = this.container[this.success() ? 'success' : 'failure'],
                options = this.options;

        if (!options.evalScripts) responseText = responseText.stripScripts();

        if (receiver = $(receiver)) {
            if (options.insertion) {
                if (Object.isString(options.insertion)) {
                    var insertion = { };
                    insertion[options.insertion] = responseText;
                    receiver.insert(insertion);
                }
                else options.insertion(receiver, responseText);
            }
            else receiver.update(responseText);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options) {
        $super(options);
        this.onComplete = this.options.onComplete;

        this.frequency = (this.options.frequency || 2);
        this.decay = (this.options.decay || 1);

        this.updater = { };
        this.container = container;
        this.url = url;

        this.start();
    },

    start: function() {
        this.options.onComplete = this.updateComplete.bind(this);
        this.onTimerEvent();
    },

    stop: function() {
        this.updater.options.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

    updateComplete: function(response) {
        if (this.options.decay) {
            this.decay = (response.responseText == this.lastText ?
                    this.decay * this.options.decay : 1);

            this.lastText = response.responseText;
        }
        this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },

    onTimerEvent: function() {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});


function $(element) {
    if (arguments.length > 1) {
        for (var i = 0, elements = [], length = arguments.length; i < length; i++)
            elements.push($(arguments[i]));
        return elements;
    }
    if (Object.isString(element))
        element = document.getElementById(element);
    return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
        var results = [];
        var query = document.evaluate(expression, $(parentElement) || document,
                null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(Element.extend(query.snapshotItem(i)));
        return results;
    };
}

/*--------------------------------------------------------------------------*/

if (!Node) var Node = { };

if (!Node.ELEMENT_NODE) {
    Object.extend(Node, {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        CDATA_SECTION_NODE: 4,
        ENTITY_REFERENCE_NODE: 5,
        ENTITY_NODE: 6,
        PROCESSING_INSTRUCTION_NODE: 7,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_TYPE_NODE: 10,
        DOCUMENT_FRAGMENT_NODE: 11,
        NOTATION_NODE: 12
    });
}


(function(global) {
    function shouldUseCache(tagName, attributes) {
        if (tagName === 'select') return false;
        if ('type' in attributes) return false;
        return true;
    }

    var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function() {
        try {
            var el = document.createElement('<input name="x">');
            return el.tagName.toLowerCase() === 'input' && el.name === 'x';
        }
        catch(err) {
            return false;
        }
    })();

    var element = global.Element;

    global.Element = function(tagName, attributes) {
        attributes = attributes || { };
        tagName = tagName.toLowerCase();
        var cache = Element.cache;

        if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
            tagName = '<' + tagName + ' name="' + attributes.name + '">';
            delete attributes.name;
            return Element.writeAttribute(document.createElement(tagName), attributes);
        }

        if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));

        var node = shouldUseCache(tagName, attributes) ?
                cache[tagName].cloneNode(false) : document.createElement(tagName);

        return Element.writeAttribute(node, attributes);
    };

    Object.extend(global.Element, element || { });
    if (element) global.Element.prototype = element.prototype;

})(this);

Element.idCounter = 1;
Element.cache = { };

Element._purgeElement = function(element) {
    var uid = element._prototypeUID;
    if (uid) {
        Element.stopObserving(element);
        element._prototypeUID = void 0;
        delete Element.Storage[uid];
    }
}

Element.Methods = {
    visible: function(element) {
        return $(element).style.display != 'none';
    },

    toggle: function(element) {
        element = $(element);
        Element[Element.visible(element) ? 'hide' : 'show'](element);
        return element;
    },

    hide: function(element) {
        element = $(element);
        element.style.display = 'none';
        return element;
    },

    show: function(element) {
        element = $(element);
        element.style.display = '';
        return element;
    },

    remove: function(element) {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
    },

    update: (function() {

        var SELECT_ELEMENT_INNERHTML_BUGGY = (function() {
            var el = document.createElement("select"),
                    isBuggy = true;
            el.innerHTML = "<option value=\"test\">test</option>";
            if (el.options && el.options[0]) {
                isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
            }
            el = null;
            return isBuggy;
        })();

        var TABLE_ELEMENT_INNERHTML_BUGGY = (function() {
            try {
                var el = document.createElement("table");
                if (el && el.tBodies) {
                    el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
                    var isBuggy = typeof el.tBodies[0] == "undefined";
                    el = null;
                    return isBuggy;
                }
            } catch (e) {
                return true;
            }
        })();

        var LINK_ELEMENT_INNERHTML_BUGGY = (function() {
            try {
                var el = document.createElement('div');
                el.innerHTML = "<link>";
                var isBuggy = (el.childNodes.length === 0);
                el = null;
                return isBuggy;
            } catch(e) {
                return true;
            }
        })();

        var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
                TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;

        var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
            var s = document.createElement("script"),
                    isBuggy = false;
            try {
                s.appendChild(document.createTextNode(""));
                isBuggy = !s.firstChild ||
                        s.firstChild && s.firstChild.nodeType !== 3;
            } catch (e) {
                isBuggy = true;
            }
            s = null;
            return isBuggy;
        })();


        function update(element, content) {
            element = $(element);
            var purgeElement = Element._purgeElement;

            var descendants = element.getElementsByTagName('*'),
                    i = descendants.length;
            while (i--) purgeElement(descendants[i]);

            if (content && content.toElement)
                content = content.toElement();

            if (Object.isElement(content))
                return element.update().insert(content);

            content = Object.toHTML(content);

            var tagName = element.tagName.toUpperCase();

            if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
                element.text = content;
                return element;
            }

            if (ANY_INNERHTML_BUGGY) {
                if (tagName in Element._insertionTranslations.tags) {
                    while (element.firstChild) {
                        element.removeChild(element.firstChild);
                    }
                    Element._getContentFromAnonymousElement(tagName, content.stripScripts())
                            .each(function(node) {
                        element.appendChild(node)
                    });
                } else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
                    while (element.firstChild) {
                        element.removeChild(element.firstChild);
                    }
                    var nodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts(), true);
                    nodes.each(function(node) {
                        element.appendChild(node)
                    });
                }
                else {
                    element.innerHTML = content.stripScripts();
                }
            }
            else {
                element.innerHTML = content.stripScripts();
            }

            content.evalScripts.bind(content).defer();
            return element;
        }

        return update;
    })(),

    replace: function(element, content) {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        else if (!Object.isElement(content)) {
            content = Object.toHTML(content);
            var range = element.ownerDocument.createRange();
            range.selectNode(element);
            content.evalScripts.bind(content).defer();
            content = range.createContextualFragment(content.stripScripts());
        }
        element.parentNode.replaceChild(content, element);
        return element;
    },

    insert: function(element, insertions) {
        element = $(element);

        if (Object.isString(insertions) || Object.isNumber(insertions) ||
                Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = {bottom:insertions};

        var content, insert, tagName, childNodes;

        for (var position in insertions) {
            content = insertions[position];
            position = position.toLowerCase();
            insert = Element._insertionTranslations[position];

            if (content && content.toElement) content = content.toElement();
            if (Object.isElement(content)) {
                insert(element, content);
                continue;
            }

            content = Object.toHTML(content);

            tagName = ((position == 'before' || position == 'after')
                    ? element.parentNode : element).tagName.toUpperCase();

            childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

            if (position == 'top' || position == 'after') childNodes.reverse();
            childNodes.each(insert.curry(element));

            content.evalScripts.bind(content).defer();
        }

        return element;
    },

    wrap: function(element, wrapper, attributes) {
        element = $(element);
        if (Object.isElement(wrapper))
            $(wrapper).writeAttribute(attributes || { });
        else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
        else wrapper = new Element('div', wrapper);
        if (element.parentNode)
            element.parentNode.replaceChild(wrapper, element);
        wrapper.appendChild(element);
        return wrapper;
    },

    inspect: function(element) {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();
        $H({'id': 'id', 'className': 'class'}).each(function(pair) {
            var property = pair.first(),
                    attribute = pair.last(),
                    value = (element[property] || '').toString();
            if (value) result += ' ' + attribute + '=' + value.inspect(true);
        });
        return result + '>';
    },

    recursivelyCollect: function(element, property, maximumLength) {
        element = $(element);
        maximumLength = maximumLength || -1;
        var elements = [];

        while (element = element[property]) {
            if (element.nodeType == 1)
                elements.push(Element.extend(element));
            if (elements.length == maximumLength)
                break;
        }

        return elements;
    },

    ancestors: function(element) {
        return Element.recursivelyCollect(element, 'parentNode');
    },

    descendants: function(element) {
        return Element.select(element, "*");
    },

    firstDescendant: function(element) {
        element = $(element).firstChild;
        while (element && element.nodeType != 1) element = element.nextSibling;
        return $(element);
    },

    immediateDescendants: function(element) {
        var results = [], child = $(element).firstChild;
        while (child) {
            if (child.nodeType === 1) {
                results.push(Element.extend(child));
            }
            child = child.nextSibling;
        }
        return results;
    },

    previousSiblings: function(element, maximumLength) {
        return Element.recursivelyCollect(element, 'previousSibling');
    },

    nextSiblings: function(element) {
        return Element.recursivelyCollect(element, 'nextSibling');
    },

    siblings: function(element) {
        element = $(element);
        return Element.previousSiblings(element).reverse()
                .concat(Element.nextSiblings(element));
    },

    match: function(element, selector) {
        element = $(element);
        if (Object.isString(selector))
            return Prototype.Selector.match(element, selector);
        return selector.match(element);
    },

    up: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(element.parentNode);
        var ancestors = Element.ancestors(element);
        return Object.isNumber(expression) ? ancestors[expression] :
                Prototype.Selector.find(ancestors, expression, index);
    },

    down: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return Element.firstDescendant(element);
        return Object.isNumber(expression) ? Element.descendants(element)[expression] :
                Element.select(element, expression)[index || 0];
    },

    previous: function(element, expression, index) {
        element = $(element);
        if (Object.isNumber(expression)) index = expression,expression = false;
        if (!Object.isNumber(index)) index = 0;

        if (expression) {
            return Prototype.Selector.find(element.previousSiblings(), expression, index);
        } else {
            return element.recursivelyCollect("previousSibling", index + 1)[index];
        }
    },

    next: function(element, expression, index) {
        element = $(element);
        if (Object.isNumber(expression)) index = expression,expression = false;
        if (!Object.isNumber(index)) index = 0;

        if (expression) {
            return Prototype.Selector.find(element.nextSiblings(), expression, index);
        } else {
            var maximumLength = Object.isNumber(index) ? index + 1 : 1;
            return element.recursivelyCollect("nextSibling", index + 1)[index];
        }
    },


    select: function(element) {
        element = $(element);
        var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
        return Prototype.Selector.select(expressions, element);
    },

    adjacent: function(element) {
        element = $(element);
        var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
        return Prototype.Selector.select(expressions, element.parentNode).without(element);
    },

    identify: function(element) {
        element = $(element);
        var id = Element.readAttribute(element, 'id');
        if (id) return id;
        do {
            id = 'anonymous_element_' + Element.idCounter++
        } while ($(id));
        Element.writeAttribute(element, 'id', id);
        return id;
    },

    readAttribute: function(element, name) {
        element = $(element);
        if (Prototype.Browser.IE) {
            var t = Element._attributeTranslations.read;
            if (t.values[name]) return t.values[name](element, name);
            if (t.names[name]) name = t.names[name];
            if (name.include(':')) {
                return (!element.attributes || !element.attributes[name]) ? null :
                        element.attributes[name].value;
            }
        }
        return element.getAttribute(name);
    },

    writeAttribute: function(element, name, value) {
        element = $(element);
        var attributes = { }, t = Element._attributeTranslations.write;

        if (typeof name == 'object') attributes = name;
        else attributes[name] = Object.isUndefined(value) ? true : value;

        for (var attr in attributes) {
            name = t.names[attr] || attr;
            value = attributes[attr];
            if (t.values[attr]) name = t.values[attr](element, value);
            if (value === false || value === null)
                element.removeAttribute(name);
            else if (value === true)
                element.setAttribute(name, name);
            else element.setAttribute(name, value);
        }
        return element;
    },

    getHeight: function(element) {
        return Element.getDimensions(element).height;
    },

    getWidth: function(element) {
        return Element.getDimensions(element).width;
    },

    classNames: function(element) {
        return new Element.ClassNames(element);
    },

    hasClassName: function(element, className) {
        if (!(element = $(element))) return;
        var elementClassName = element.className;
        return (elementClassName.length > 0 && (elementClassName == className ||
                new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
    },

    addClassName: function(element, className) {
        if (!(element = $(element))) return;
        if (!Element.hasClassName(element, className))
            element.className += (element.className ? ' ' : '') + className;
        return element;
    },

    removeClassName: function(element, className) {
        if (!(element = $(element))) return;
        element.className = element.className.replace(
                new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
        return element;
    },

    toggleClassName: function(element, className) {
        if (!(element = $(element))) return;
        return Element[Element.hasClassName(element, className) ?
                'removeClassName' : 'addClassName'](element, className);
    },

    cleanWhitespace: function(element) {
        element = $(element);
        var node = element.firstChild;
        while (node) {
            var nextNode = node.nextSibling;
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
                element.removeChild(node);
            node = nextNode;
        }
        return element;
    },

    empty: function(element) {
        return $(element).innerHTML.blank();
    },

    descendantOf: function(element, ancestor) {
        element = $(element),ancestor = $(ancestor);

        if (element.compareDocumentPosition)
            return (element.compareDocumentPosition(ancestor) & 8) === 8;

        if (ancestor.contains)
            return ancestor.contains(element) && ancestor !== element;

        while (element = element.parentNode)
            if (element == ancestor) return true;

        return false;
    },

    scrollTo: function(element) {
        element = $(element);
        var pos = Element.cumulativeOffset(element);
        window.scrollTo(pos[0], pos[1]);
        return element;
    },

    getStyle: function(element, style) {
        element = $(element);
        style = style == 'float' ? 'cssFloat' : style.camelize();
        var value = element.style[style];
        if (!value || value == 'auto') {
            if (document.defaultView && document.defaultView.getComputedStyle) {
                var css = document.defaultView.getComputedStyle(element, null);
                value = css ? css[style] : null;
            } else if (element.currentStyle) {
                value = element.currentStyle[style];
            } else {
                value = element.style[style];
            }
        }
        if (style == 'opacity') return value ? parseFloat(value) : 1.0;
        return value == 'auto' ? null : value;
    },

    getOpacity: function(element) {
        return $(element).getStyle('opacity');
    },

    setStyle: function(element, styles) {
        element = $(element);
        var elementStyle = element.style, match;
        if (Object.isString(styles)) {
            element.style.cssText += ';' + styles;
            return styles.include('opacity') ?
                    element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
        }
        for (var property in styles)
            if (property == 'opacity') element.setOpacity(styles[property]);
            else
                elementStyle[(property == 'float' || property == 'cssFloat') ?
                        (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
                        property] = styles[property];

        return element;
    },

    setOpacity: function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
                (value < 0.00001) ? 0 : value;
        return element;
    },

    makePositioned: function(element) {
        element = $(element);
        var pos = Element.getStyle(element, 'position');
        if (pos == 'static' || !pos) {
            element._madePositioned = true;
            element.style.position = 'relative';
            if (Prototype.Browser.Opera) {
                element.style.top = 0;
                element.style.left = 0;
            }
        }
        return element;
    },

    undoPositioned: function(element) {
        element = $(element);
        if (element._madePositioned) {
            element._madePositioned = undefined;
            element.style.position =
                    element.style.top =
                            element.style.left =
                                    element.style.bottom =
                                            element.style.right = '';
        }
        return element;
    },

    makeClipping: function(element) {
        element = $(element);
        if (element._overflow) return element;
        element._overflow = Element.getStyle(element, 'overflow') || 'auto';
        if (element._overflow !== 'hidden')
            element.style.overflow = 'hidden';
        return element;
    },

    undoClipping: function(element) {
        element = $(element);
        if (!element._overflow) return element;
        element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
        element._overflow = null;
        return element;
    },

    clonePosition: function(element, source) {
        var options = Object.extend({
            setLeft:    true,
            setTop:     true,
            setWidth:   true,
            setHeight:  true,
            offsetTop:  0,
            offsetLeft: 0
        }, arguments[2] || { });

        source = $(source);
        var p = Element.viewportOffset(source), delta = [0, 0], parent = null;

        element = $(element);

        if (Element.getStyle(element, 'position') == 'absolute') {
            parent = Element.getOffsetParent(element);
            delta = Element.viewportOffset(parent);
        }

        if (parent == document.body) {
            delta[0] -= document.body.offsetLeft;
            delta[1] -= document.body.offsetTop;
        }

        if (options.setLeft)   element.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
        if (options.setTop)    element.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
        if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
        if (options.setHeight) element.style.height = source.offsetHeight + 'px';
        return element;
    }
};

Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,

    childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
    write: {
        names: {
            className: 'class',
            htmlFor:   'for'
        },
        values: { }
    }
};

if (Prototype.Browser.Opera) {
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
            function(proceed, element, style) {
                switch (style) {
                    case 'height': case 'width':
                    if (!Element.visible(element)) return null;

                    var dim = parseInt(proceed(element, style), 10);

                    if (dim !== element['offset' + style.capitalize()])
                        return dim + 'px';

                    var properties;
                    if (style === 'height') {
                        properties = ['border-top-width', 'padding-top',
                            'padding-bottom', 'border-bottom-width'];
                    }
                    else {
                        properties = ['border-left-width', 'padding-left',
                            'padding-right', 'border-right-width'];
                    }
                    return properties.inject(dim, function(memo, property) {
                        var val = proceed(element, property);
                        return val === null ? memo : memo - parseInt(val, 10);
                    }) + 'px';
                    default: return proceed(element, style);
                }
            }
            );

    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
            function(proceed, element, attribute) {
                if (attribute === 'title') return element.title;
                return proceed(element, attribute);
            }
            );
}

else if (Prototype.Browser.IE) {
	if (navigator.appVersion.match(/MSIE\s+(?:6|7|8)\./)) { // avoid applying to IE9 and IE10
		Element.Methods.getStyle = function(element, style) {
			element = $(element);
			style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
			var value = element.style[style];
			if (!value && element.currentStyle) value = element.currentStyle[style];

			if (style == 'opacity') {
				if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
					if (value[1]) return parseFloat(value[1]) / 100;
				return 1.0;
			}

			if (value == 'auto') {
				if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
					return element['offset' + style.capitalize()] + 'px';
				return null;
			}
			return value;
		};

		Element.Methods.setOpacity = function(element, value) {
			function stripAlpha(filter) {
				return filter.replace(/alpha\([^\)]*\)/gi, '');
			}

			element = $(element);
			var currentStyle = element.currentStyle;
			if ((currentStyle && !currentStyle.hasLayout) ||
					(!currentStyle && element.style.zoom == 'normal'))
				element.style.zoom = 1;

			var filter = element.getStyle('filter'), style = element.style;
			if (value == 1 || value === '') {
				(filter = stripAlpha(filter)) ?
						style.filter = filter : style.removeAttribute('filter');
				return element;
			} else if (value < 0.00001) value = 0;
			style.filter = stripAlpha(filter) +
					'alpha(opacity=' + (value * 100) + ')';
			return element;
		};
	}

    Element._attributeTranslations = (function() {

        var classProp = 'className',
                forProp = 'for',
                el = document.createElement('div');

        el.setAttribute(classProp, 'x');

        if (el.className !== 'x') {
            el.setAttribute('class', 'x');
            if (el.className === 'x') {
                classProp = 'class';
            }
        }
        el = null;

        el = document.createElement('label');
        el.setAttribute(forProp, 'x');
        if (el.htmlFor !== 'x') {
            el.setAttribute('htmlFor', 'x');
            if (el.htmlFor === 'x') {
                forProp = 'htmlFor';
            }
        }
        el = null;

        return {
            read: {
                names: {
                    'class':      classProp,
                    'className':  classProp,
                    'for':        forProp,
                    'htmlFor':    forProp
                },
                values: {
                    _getAttr: function(element, attribute) {
                        return element.getAttribute(attribute);
                    },
                    _getAttr2: function(element, attribute) {
                        return element.getAttribute(attribute, 2);
                    },
                    _getAttrNode: function(element, attribute) {
                        var node = element.getAttributeNode(attribute);
                        return node ? node.value : "";
                    },
                    _getEv: (function() {

                        var el = document.createElement('div'), f;
                        el.onclick = Prototype.emptyFunction;
                        var value = el.getAttribute('onclick');

                        if (String(value).indexOf('{') > -1) {
                            f = function(element, attribute) {
                                attribute = element.getAttribute(attribute);
                                if (!attribute) return null;
                                attribute = attribute.toString();
                                attribute = attribute.split('{')[1];
                                attribute = attribute.split('}')[0];
                                return attribute.strip();
                            };
                        }
                        else if (value === '') {
                            f = function(element, attribute) {
                                attribute = element.getAttribute(attribute);
                                if (!attribute) return null;
                                return attribute.strip();
                            };
                        }
                        el = null;
                        return f;
                    })(),
                    _flag: function(element, attribute) {
                        return $(element).hasAttribute(attribute) ? attribute : null;
                    },
                    style: function(element) {
                        return element.style.cssText.toLowerCase();
                    },
                    title: function(element) {
                        return element.title;
                    }
                }
            }
        }
    })();

    Element._attributeTranslations.write = {
        names: Object.extend({
            cellpadding: 'cellPadding',
            cellspacing: 'cellSpacing'
        }, Element._attributeTranslations.read.names),
        values: {
            checked: function(element, value) {
                element.checked = !!value;
            },

            style: function(element, value) {
                element.style.cssText = value ? value : '';
            }
        }
    };

    Element._attributeTranslations.has = {};

    $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
            'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
        Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
        Element._attributeTranslations.has[attr.toLowerCase()] = attr;
    });

    (function(v) {
        Object.extend(v, {
            href:        v._getAttr2,
            src:         v._getAttr2,
            type:        v._getAttr,
            action:      v._getAttrNode,
            disabled:    v._flag,
            checked:     v._flag,
            readonly:    v._flag,
            multiple:    v._flag,
            onload:      v._getEv,
            onunload:    v._getEv,
            onclick:     v._getEv,
            ondblclick:  v._getEv,
            onmousedown: v._getEv,
            onmouseup:   v._getEv,
            onmouseover: v._getEv,
            onmousemove: v._getEv,
            onmouseout:  v._getEv,
            onfocus:     v._getEv,
            onblur:      v._getEv,
            onkeypress:  v._getEv,
            onkeydown:   v._getEv,
            onkeyup:     v._getEv,
            onsubmit:    v._getEv,
            onreset:     v._getEv,
            onselect:    v._getEv,
            onchange:    v._getEv
        });
    })(Element._attributeTranslations.read.values);

    if (Prototype.BrowserFeatures.ElementExtensions) {
        (function() {
            function _descendants(element) {
                var nodes = element.getElementsByTagName('*'), results = [];
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node.tagName !== "!") // Filter out comment nodes.
                        results.push(node);
                return results;
            }

            Element.Methods.down = function(element, expression, index) {
                element = $(element);
                if (arguments.length == 1) return element.firstDescendant();
                return Object.isNumber(expression) ? _descendants(element)[expression] :
                        Element.select(element, expression)[index || 0];
            }
        })();
    }

}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
    Element.Methods.setOpacity = function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1) ? 0.999999 :
                (value === '') ? '' : (value < 0.00001) ? 0 : value;
        return element;
    };
}

else if (Prototype.Browser.WebKit) {
    Element.Methods.setOpacity = function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
                (value < 0.00001) ? 0 : value;

        if (value == 1)
            if (element.tagName.toUpperCase() == 'IMG' && element.width) {
                element.width++;
                element.width--;
            } else try {
                var n = document.createTextNode(' ');
                element.appendChild(n);
                element.removeChild(n);
            } catch (e) {
            }

        return element;
    };
}

if ('outerHTML' in document.documentElement) {
    Element.Methods.replace = function(element, content) {
        element = $(element);

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
            element.parentNode.replaceChild(content, element);
            return element;
        }

        content = Object.toHTML(content);
        var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

        if (Element._insertionTranslations.tags[tagName]) {
            var nextSibling = element.next(),
                    fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
            parent.removeChild(element);
            if (nextSibling)
                fragments.each(function(node) {
                    parent.insertBefore(node, nextSibling)
                });
            else
                fragments.each(function(node) {
                    parent.appendChild(node)
                });
        }
        else element.outerHTML = content.stripScripts();

        content.evalScripts.bind(content).defer();
        return element;
    };
}

Element._returnOffset = function(l, t) {
    var result = [l, t];
    result.left = l;
    result.top = t;
    return result;
};

Element._getContentFromAnonymousElement = function(tagName, html, force) {
    var div = new Element('div'),
            t = Element._insertionTranslations.tags[tagName];

    var workaround = false;
    if (t) workaround = true;
    else if (force) {
        workaround = true;
        t = ['', '', 0];
    }

    if (workaround) {
        div.innerHTML = '&nbsp;' + t[0] + html + t[1];
        div.removeChild(div.firstChild);
        for (var i = t[2]; i--;) {
            div = div.firstChild;
        }
    }
    else {
        div.innerHTML = html;
    }
    return $A(div.childNodes);
};

Element._insertionTranslations = {
    before: function(element, node) {
        element.parentNode.insertBefore(node, element);
    },
    top: function(element, node) {
        element.insertBefore(node, element.firstChild);
    },
    bottom: function(element, node) {
        element.appendChild(node);
    },
    after: function(element, node) {
        element.parentNode.insertBefore(node, element.nextSibling);
    },
    tags: {
        TABLE:  ['<table>',                '</table>',                   1],
        TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
        TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
        TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
        SELECT: ['<select>',               '</select>',                  1]
    }
};

(function() {
    var tags = Element._insertionTranslations.tags;
    Object.extend(tags, {
        THEAD: tags.TBODY,
        TFOOT: tags.TBODY,
        TH:    tags.TD
    });
})();

Element.Methods.Simulated = {
    hasAttribute: function(element, attribute) {
        attribute = Element._attributeTranslations.has[attribute] || attribute;
        var node = $(element).getAttributeNode(attribute);
        return !!(node && node.specified);
    }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

(function(div) {

    if (!Prototype.BrowserFeatures.ElementExtensions && div['__proto__']) {
        window.HTMLElement = { };
        window.HTMLElement.prototype = div['__proto__'];
        Prototype.BrowserFeatures.ElementExtensions = true;
    }

    div = null;

})(document.createElement('div'));

Element.extend = (function() {

    function checkDeficiency(tagName) {
        if (typeof window.Element != 'undefined') {
            var proto = window.Element.prototype;
            if (proto) {
                var id = '_' + (Math.random() + '').slice(2),
                        el = document.createElement(tagName);
                proto[id] = 'x';
                var isBuggy = (el[id] !== 'x');
                delete proto[id];
                el = null;
                return isBuggy;
            }
        }
        return false;
    }

    function extendElementWith(element, methods) {
        for (var property in methods) {
            var value = methods[property];
            if (Object.isFunction(value) && !(property in element))
                element[property] = value.methodize();
        }
    }

    var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY = checkDeficiency('object');

    if (Prototype.BrowserFeatures.SpecificElementExtensions) {
        if (HTMLOBJECTELEMENT_PROTOTYPE_BUGGY) {
            return function(element) {
                if (element && typeof element._extendedByPrototype == 'undefined') {
                    var t = element.tagName;
                    if (t && (/^(?:object|applet|embed)$/i.test(t))) {
                        extendElementWith(element, Element.Methods);
                        extendElementWith(element, Element.Methods.Simulated);
                        extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
                    }
                }
                return element;
            }
        }
        return Prototype.K;
    }

    var Methods = { }, ByTag = Element.Methods.ByTag;

    var extend = Object.extend(function(element) {
        if (!element || typeof element._extendedByPrototype != 'undefined' ||
                element.nodeType != 1 || element == window) return element;

        var methods = Object.clone(Methods),
                tagName = element.tagName.toUpperCase();

        if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

        extendElementWith(element, methods);

        element._extendedByPrototype = Prototype.emptyFunction;
        return element;

    }, {
        refresh: function() {
            if (!Prototype.BrowserFeatures.ElementExtensions) {
                Object.extend(Methods, Element.Methods);
                Object.extend(Methods, Element.Methods.Simulated);
            }
        }
    });

    extend.refresh();
    return extend;
})();

if (document.documentElement.hasAttribute) {
    Element.hasAttribute = function(element, attribute) {
        return element.hasAttribute(attribute);
    };
}
else {
    Element.hasAttribute = Element.Methods.Simulated.hasAttribute;
}

Element.addMethods = function(methods) {
    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

    if (!methods) {
        Object.extend(Form, Form.Methods);
        Object.extend(Form.Element, Form.Element.Methods);
        Object.extend(Element.Methods.ByTag, {
            "FORM":     Object.clone(Form.Methods),
            "INPUT":    Object.clone(Form.Element.Methods),
            "SELECT":   Object.clone(Form.Element.Methods),
            "TEXTAREA": Object.clone(Form.Element.Methods),
            "BUTTON":   Object.clone(Form.Element.Methods)
        });
    }

    if (arguments.length == 2) {
        var tagName = methods;
        methods = arguments[1];
    }

    if (!tagName) Object.extend(Element.Methods, methods || { });
    else {
        if (Object.isArray(tagName)) tagName.each(extend);
        else extend(tagName);
    }

    function extend(tagName) {
        tagName = tagName.toUpperCase();
        if (!Element.Methods.ByTag[tagName])
            Element.Methods.ByTag[tagName] = { };
        Object.extend(Element.Methods.ByTag[tagName], methods);
    }

    function copy(methods, destination, onlyIfAbsent) {
        onlyIfAbsent = onlyIfAbsent || false;
        for (var property in methods) {
            var value = methods[property];
            if (!Object.isFunction(value)) continue;
            if (!onlyIfAbsent || !(property in destination))
                destination[property] = value.methodize();
        }
    }

    function findDOMClass(tagName) {
        var klass;
        var trans = {
            "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
            "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
            "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
            "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
            "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
                    "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
                    "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
                    "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
                    "FrameSet", "IFRAME": "IFrame"
        };
        if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName.capitalize() + 'Element';
        if (window[klass]) return window[klass];

        var element = document.createElement(tagName),
                proto = element['__proto__'] || element.constructor.prototype;

        element = null;
        return proto;
    }

    var elementPrototype = window.HTMLElement ? HTMLElement.prototype :
            Element.prototype;

    if (F.ElementExtensions) {
        copy(Element.Methods, elementPrototype);
        copy(Element.Methods.Simulated, elementPrototype, true);
    }

    if (F.SpecificElementExtensions) {
        for (var tag in Element.Methods.ByTag) {
            var klass = findDOMClass(tag);
            if (Object.isUndefined(klass)) continue;
            copy(T[tag], klass.prototype);
        }
    }

    Object.extend(Element, Element.Methods);
    delete Element.ByTag;

    if (Element.extend.refresh) Element.extend.refresh();
    Element.cache = { };
};


document.viewport = {

    getDimensions: function() {
        return { width: this.getWidth(), height: this.getHeight() };
    },

    getScrollOffsets: function() {
        return Element._returnOffset(
                window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
                window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
    }
};

(function(viewport) {
    var B = Prototype.Browser, doc = document, element, property = {};

    function getRootElement() {
        if (B.WebKit && !doc.evaluate)
            return document;

        if (B.Opera && window.parseFloat(window.opera.version()) < 9.5)
            return document.body;

        return document.documentElement;
    }

    function define(D) {
        if (!element) element = getRootElement();

        property[D] = 'client' + D;

        viewport['get' + D] = function() {
            return element[property[D]]
        };
        return viewport['get' + D]();
    }

    viewport.getWidth = define.curry('Width');

    viewport.getHeight = define.curry('Height');
})(document.viewport);


Element.Storage = {
    UID: 1
};

Element.addMethods({
    getStorage: function(element) {
        if (!(element = $(element))) return;

        var uid;
        if (element === window) {
            uid = 0;
        } else {
            if (typeof element._prototypeUID === "undefined")
                element._prototypeUID = Element.Storage.UID++;
            uid = element._prototypeUID;
        }

        if (!Element.Storage[uid])
            Element.Storage[uid] = $H();

        return Element.Storage[uid];
    },

    store: function(element, key, value) {
        if (!(element = $(element))) return;

        if (arguments.length === 2) {
            Element.getStorage(element).update(key);
        } else {
            Element.getStorage(element).set(key, value);
        }

        return element;
    },

    retrieve: function(element, key, defaultValue) {
        if (!(element = $(element))) return;
        var hash = Element.getStorage(element), value = hash.get(key);

        if (Object.isUndefined(value)) {
            hash.set(key, defaultValue);
            value = defaultValue;
        }

        return value;
    },

    clone: function(element, deep) {
        if (!(element = $(element))) return;
        var clone = element.cloneNode(deep);
        clone._prototypeUID = void 0;
        if (deep) {
            var descendants = Element.select(clone, '*'),
                    i = descendants.length;
            while (i--) {
                descendants[i]._prototypeUID = void 0;
            }
        }
        return Element.extend(clone);
    },

    purge: function(element) {
        if (!(element = $(element))) return;
        var purgeElement = Element._purgeElement;

        purgeElement(element);

        var descendants = element.getElementsByTagName('*'),
                i = descendants.length;

        while (i--) purgeElement(descendants[i]);

        return null;
    }
});

(function() {

    function toDecimal(pctString) {
        var match = pctString.match(/^(\d+)%?$/i);
        if (!match) return null;
        return (Number(match[1]) / 100);
    }

    function getPixelValue(value, property, context) {
        var element = null;
        if (Object.isElement(value)) {
            element = value;
            value = element.getStyle(property);
        }

        if (value === null) {
            return null;
        }

        if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
            return window.parseFloat(value);
        }

        var isPercentage = value.include('%'), isViewport = (context === document.viewport);

        if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
            var style = element.style.left, rStyle = element.runtimeStyle.left;
            element.runtimeStyle.left = element.currentStyle.left;
            element.style.left = value || 0;
            value = element.style.pixelLeft;
            element.style.left = style;
            element.runtimeStyle.left = rStyle;

            return value;
        }

        if (element && isPercentage) {
            context = context || element.parentNode;
            var decimal = toDecimal(value);
            var whole = null;
            var position = element.getStyle('position');

            var isHorizontal = property.include('left') || property.include('right') ||
                    property.include('width');

            var isVertical = property.include('top') || property.include('bottom') ||
                    property.include('height');

            if (context === document.viewport) {
                if (isHorizontal) {
                    whole = document.viewport.getWidth();
                } else if (isVertical) {
                    whole = document.viewport.getHeight();
                }
            } else {
                if (isHorizontal) {
                    whole = $(context).measure('width');
                } else if (isVertical) {
                    whole = $(context).measure('height');
                }
            }

            return (whole === null) ? 0 : whole * decimal;
        }

        return 0;
    }

    function toCSSPixels(number) {
        if (Object.isString(number) && number.endsWith('px')) {
            return number;
        }
        return number + 'px';
    }

    function isDisplayed(element) {
        var originalElement = element;
        while (element && element.parentNode) {
            var display = element.getStyle('display');
            if (display === 'none') {
                return false;
            }
            element = $(element.parentNode);
        }
        return true;
    }

    var hasLayout = Prototype.K;
    if ('currentStyle' in document.documentElement) {
        hasLayout = function(element) {
            if (!element.currentStyle.hasLayout) {
                element.style.zoom = 1;
            }
            return element;
        };
    }

    function cssNameFor(key) {
        if (key.include('border')) key = key + '-width';
        return key.camelize();
    }

    Element.Layout = Class.create(Hashtable, {
        initialize: function($super, element, preCompute) {
            $super();
            this.element = $(element);

            Element.Layout.PROPERTIES.each(function(property) {
                this._set(property, null);
            }, this);

            if (preCompute) {
                this._preComputing = true;
                this._begin();
                Element.Layout.PROPERTIES.each(this._compute, this);
                this._end();
                this._preComputing = false;
            }
        },

        _set: function(property, value) {
            return Hashtable.prototype.set.call(this, property, value);
        },

        set: function(property, value) {
            throw "Properties of Element.Layout are read-only.";
        },

        get: function($super, property) {
            var value = $super(property);
            return value === null ? this._compute(property) : value;
        },

        _begin: function() {
            if (this._prepared) return;

            var element = this.element;
            if (isDisplayed(element)) {
                this._prepared = true;
                return;
            }

            var originalStyles = {
                position:   element.style.position || '',
                width:      element.style.width || '',
                visibility: element.style.visibility || '',
                display:    element.style.display || ''
            };

            element.store('prototype_original_styles', originalStyles);

            var position = element.getStyle('position'),
                    width = element.getStyle('width');

            if (width === "0px" || width === null) {
                element.style.display = 'block';
                width = element.getStyle('width');
            }

            var context = (position === 'fixed') ? document.viewport :
                    element.parentNode;

            element.setStyle({
                position:   'absolute',
                visibility: 'hidden',
                display:    'block'
            });

            var positionedWidth = element.getStyle('width');

            var newWidth;
            if (width && (positionedWidth === width)) {
                newWidth = getPixelValue(element, 'width', context);
            } else if (position === 'absolute' || position === 'fixed') {
                newWidth = getPixelValue(element, 'width', context);
            } else {
                var parent = element.parentNode, pLayout = $(parent).getLayout();

                newWidth = pLayout.get('width') -
                        this.get('margin-left') -
                        this.get('border-left') -
                        this.get('padding-left') -
                        this.get('padding-right') -
                        this.get('border-right') -
                        this.get('margin-right');
            }

            element.setStyle({ width: newWidth + 'px' });

            this._prepared = true;
        },

        _end: function() {
            var element = this.element;
            var originalStyles = element.retrieve('prototype_original_styles');
            element.store('prototype_original_styles', null);
            element.setStyle(originalStyles);
            this._prepared = false;
        },

        _compute: function(property) {
            var COMPUTATIONS = Element.Layout.COMPUTATIONS;
            if (!(property in COMPUTATIONS)) {
                throw "Property not found.";
            }

            return this._set(property, COMPUTATIONS[property].call(this, this.element));
        },

        toObject: function() {
            var args = $A(arguments);
            var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
                    args.join(' ').split(' ');
            var obj = {};
            keys.each(function(key) {
                if (!Element.Layout.PROPERTIES.include(key)) return;
                var value = this.get(key);
                if (value != null) obj[key] = value;
            }, this);
            return obj;
        },

        toHash: function() {
            var obj = this.toObject.apply(this, arguments);
            return new Hashtable(obj);
        },

        toCSS: function() {
            var args = $A(arguments);
            var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
                    args.join(' ').split(' ');
            var css = {};

            keys.each(function(key) {
                if (!Element.Layout.PROPERTIES.include(key)) return;
                if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;

                var value = this.get(key);
                if (value != null) css[cssNameFor(key)] = value + 'px';
            }, this);
            return css;
        },

        inspect: function() {
            return "#<Element.Layout>";
        }
    });

    Object.extend(Element.Layout, {
        PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),

        COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),

        COMPUTATIONS: {
            'height': function(element) {
                if (!this._preComputing) this._begin();

                var bHeight = this.get('border-box-height');
                if (bHeight <= 0) {
                    if (!this._preComputing) this._end();
                    return 0;
                }

                var bTop = this.get('border-top'),
                        bBottom = this.get('border-bottom');

                var pTop = this.get('padding-top'),
                        pBottom = this.get('padding-bottom');

                if (!this._preComputing) this._end();

                return bHeight - bTop - bBottom - pTop - pBottom;
            },

            'width': function(element) {
                if (!this._preComputing) this._begin();

                var bWidth = this.get('border-box-width');
                if (bWidth <= 0) {
                    if (!this._preComputing) this._end();
                    return 0;
                }

                var bLeft = this.get('border-left'),
                        bRight = this.get('border-right');

                var pLeft = this.get('padding-left'),
                        pRight = this.get('padding-right');

                if (!this._preComputing) this._end();

                return bWidth - bLeft - bRight - pLeft - pRight;
            },

            'padding-box-height': function(element) {
                var height = this.get('height'),
                        pTop = this.get('padding-top'),
                        pBottom = this.get('padding-bottom');

                return height + pTop + pBottom;
            },

            'padding-box-width': function(element) {
                var width = this.get('width'),
                        pLeft = this.get('padding-left'),
                        pRight = this.get('padding-right');

                return width + pLeft + pRight;
            },

            'border-box-height': function(element) {
                if (!this._preComputing) this._begin();
                var height = element.offsetHeight;
                if (!this._preComputing) this._end();
                return height;
            },

            'border-box-width': function(element) {
                if (!this._preComputing) this._begin();
                var width = element.offsetWidth;
                if (!this._preComputing) this._end();
                return width;
            },

            'margin-box-height': function(element) {
                var bHeight = this.get('border-box-height'),
                        mTop = this.get('margin-top'),
                        mBottom = this.get('margin-bottom');

                if (bHeight <= 0) return 0;

                return bHeight + mTop + mBottom;
            },

            'margin-box-width': function(element) {
                var bWidth = this.get('border-box-width'),
                        mLeft = this.get('margin-left'),
                        mRight = this.get('margin-right');

                if (bWidth <= 0) return 0;

                return bWidth + mLeft + mRight;
            },

            'top': function(element) {
                var offset = element.positionedOffset();
                return offset.top;
            },

            'bottom': function(element) {
                var offset = element.positionedOffset(),
                        parent = element.getOffsetParent(),
                        pHeight = parent.measure('height');

                var mHeight = this.get('border-box-height');

                return pHeight - mHeight - offset.top;
            },

            'left': function(element) {
                var offset = element.positionedOffset();
                return offset.left;
            },

            'right': function(element) {
                var offset = element.positionedOffset(),
                        parent = element.getOffsetParent(),
                        pWidth = parent.measure('width');

                var mWidth = this.get('border-box-width');

                return pWidth - mWidth - offset.left;
            },

            'padding-top': function(element) {
                return getPixelValue(element, 'paddingTop');
            },

            'padding-bottom': function(element) {
                return getPixelValue(element, 'paddingBottom');
            },

            'padding-left': function(element) {
                return getPixelValue(element, 'paddingLeft');
            },

            'padding-right': function(element) {
                return getPixelValue(element, 'paddingRight');
            },

            'border-top': function(element) {
                return getPixelValue(element, 'borderTopWidth');
            },

            'border-bottom': function(element) {
                return getPixelValue(element, 'borderBottomWidth');
            },

            'border-left': function(element) {
                return getPixelValue(element, 'borderLeftWidth');
            },

            'border-right': function(element) {
                return getPixelValue(element, 'borderRightWidth');
            },

            'margin-top': function(element) {
                return getPixelValue(element, 'marginTop');
            },

            'margin-bottom': function(element) {
                return getPixelValue(element, 'marginBottom');
            },

            'margin-left': function(element) {
                return getPixelValue(element, 'marginLeft');
            },

            'margin-right': function(element) {
                return getPixelValue(element, 'marginRight');
            }
        }
    });

    if ('getBoundingClientRect' in document.documentElement) {
        Object.extend(Element.Layout.COMPUTATIONS, {
            'right': function(element) {
                var parent = hasLayout(element.getOffsetParent());
                var rect = element.getBoundingClientRect(),
                        pRect = parent.getBoundingClientRect();

                return (pRect.right - rect.right).round();
            },

            'bottom': function(element) {
                var parent = hasLayout(element.getOffsetParent());
                var rect = element.getBoundingClientRect(),
                        pRect = parent.getBoundingClientRect();

                return (pRect.bottom - rect.bottom).round();
            }
        });
    }

    Element.Offset = Class.create({
        initialize: function(left, top) {
            this.left = left.round();
            this.top = top.round();

            this[0] = this.left;
            this[1] = this.top;
        },

        relativeTo: function(offset) {
            return new Element.Offset(
                    this.left - offset.left,
                    this.top - offset.top
                    );
        },

        inspect: function() {
            return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
        },

        toString: function() {
            return "[#{left}, #{top}]".interpolate(this);
        },

        toArray: function() {
            return [this.left, this.top];
        }
    });

    function getLayout(element, preCompute) {
        return new Element.Layout(element, preCompute);
    }

    function measure(element, property) {
        return $(element).getLayout().get(property);
    }

    function getDimensions(element) {
        element = $(element);
        var display = Element.getStyle(element, 'display');

        if (display && display !== 'none') {
            return { width: element.offsetWidth, height: element.offsetHeight };
        }

        var style = element.style;
        var originalStyles = {
            visibility: style.visibility,
            position:   style.position,
            display:    style.display
        };

        var newStyles = {
            visibility: 'hidden',
            display:    'block'
        };

        if (originalStyles.position !== 'fixed')
            newStyles.position = 'absolute';

        Element.setStyle(element, newStyles);

        var dimensions = {
            width:  element.offsetWidth,
            height: element.offsetHeight
        };

        Element.setStyle(element, originalStyles);

        return dimensions;
    }

    function getOffsetParent(element) {
        element = $(element);

        if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
            return $(document.body);

        var isInline = (Element.getStyle(element, 'display') === 'inline');
        if (!isInline && element.offsetParent) return $(element.offsetParent);

        while ((element = element.parentNode) && element !== document.body) {
            if (Element.getStyle(element, 'position') !== 'static') {
                return isHtml(element) ? $(document.body) : $(element);
            }
        }

        return $(document.body);
    }


    function cumulativeOffset(element) {
        element = $(element);
        var valueT = 0, valueL = 0;
        if (element.parentNode) {
            do {
                valueT += element.offsetTop || 0;
                valueL += element.offsetLeft || 0;
                element = element.offsetParent;
            } while (element);
        }
        return new Element.Offset(valueL, valueT);
    }

    function positionedOffset(element) {
        element = $(element);

        var layout = element.getLayout();

        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) {
                if (isBody(element)) break;
                var p = Element.getStyle(element, 'position');
                if (p !== 'static') break;
            }
        } while (element);

        valueL -= layout.get('margin-top');
        valueT -= layout.get('margin-left');

        return new Element.Offset(valueL, valueT);
    }

    function cumulativeScrollOffset(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.scrollTop || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
        } while (element);
        return new Element.Offset(valueL, valueT);
    }

    function viewportOffset(forElement) {
        element = $(element);
        var valueT = 0, valueL = 0, docBody = document.body;

        var element = forElement;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            if (element.offsetParent == docBody &&
                    Element.getStyle(element, 'position') == 'absolute') break;
        } while (element = element.offsetParent);

        element = forElement;
        do {
            if (!Prototype.Browser.Opera || element == docBody) {
                valueT -= element.scrollTop || 0;
                valueL -= element.scrollLeft || 0;
            }
        } while (element = element.parentNode);
        return new Element.Offset(valueL, valueT);
    }

    function absolutize(element) {
        element = $(element);

        if (Element.getStyle(element, 'position') === 'absolute') {
            return element;
        }

        var offsetParent = getOffsetParent(element);
        var eOffset = element.viewportOffset(),
                pOffset = offsetParent.viewportOffset();

        var offset = eOffset.relativeTo(pOffset);
        var layout = element.getLayout();

        element.store('prototype_absolutize_original_styles', {
            left:   element.getStyle('left'),
            top:    element.getStyle('top'),
            width:  element.getStyle('width'),
            height: element.getStyle('height')
        });

        element.setStyle({
            position: 'absolute',
            top:    offset.top + 'px',
            left:   offset.left + 'px',
            width:  layout.get('width') + 'px',
            height: layout.get('height') + 'px'
        });

        return element;
    }

    function relativize(element) {
        element = $(element);
        if (Element.getStyle(element, 'position') === 'relative') {
            return element;
        }

        var originalStyles =
                element.retrieve('prototype_absolutize_original_styles');

        if (originalStyles) element.setStyle(originalStyles);
        return element;
    }

    if (Prototype.Browser.IE) {
        getOffsetParent = getOffsetParent.wrap(
                function(proceed, element) {
                    element = $(element);

                    if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
                        return $(document.body);

                    var position = element.getStyle('position');
                    if (position !== 'static') return proceed(element);

                    element.setStyle({ position: 'relative' });
                    var value = proceed(element);
                    element.setStyle({ position: position });
                    return value;
                }
                );

        positionedOffset = positionedOffset.wrap(function(proceed, element) {
            element = $(element);
            if (!element.parentNode) return new Element.Offset(0, 0);
            var position = element.getStyle('position');
            if (position !== 'static') return proceed(element);

            var offsetParent = element.getOffsetParent();
            if (offsetParent && offsetParent.getStyle('position') === 'fixed')
                hasLayout(offsetParent);

            element.setStyle({ position: 'relative' });
            var value = proceed(element);
            element.setStyle({ position: position });
            return value;
        });
    } else if (Prototype.Browser.Webkit) {
        cumulativeOffset = function(element) {
            element = $(element);
            var valueT = 0, valueL = 0;
            do {
                valueT += element.offsetTop || 0;
                valueL += element.offsetLeft || 0;
                if (element.offsetParent == document.body)
                    if (Element.getStyle(element, 'position') == 'absolute') break;

                element = element.offsetParent;
            } while (element);

            return new Element.Offset(valueL, valueT);
        };
    }


    Element.addMethods({
        getLayout:              getLayout,
        measure:                measure,
        getDimensions:          getDimensions,
        getOffsetParent:        getOffsetParent,
        cumulativeOffset:       cumulativeOffset,
        positionedOffset:       positionedOffset,
        cumulativeScrollOffset: cumulativeScrollOffset,
        viewportOffset:         viewportOffset,
        absolutize:             absolutize,
        relativize:             relativize
    });

    function isBody(element) {
        return element.nodeName.toUpperCase() === 'BODY';
    }

    function isHtml(element) {
        return element.nodeName.toUpperCase() === 'HTML';
    }

    function isDocument(element) {
        return element.nodeType === Node.DOCUMENT_NODE;
    }

    function isDetached(element) {
        return element !== document.body &&
                !Element.descendantOf(element, document.body);
    }

    if ('getBoundingClientRect' in document.documentElement) {
        Element.addMethods({
            viewportOffset: function(element) {
                element = $(element);
                if (isDetached(element)) return new Element.Offset(0, 0);

                var rect = element.getBoundingClientRect(),
                        docEl = document.documentElement;
                return new Element.Offset(rect.left - docEl.clientLeft,
                        rect.top - docEl.clientTop);
            }
        });
    }
})();
window.$$ = function() {
    var expression = $A(arguments).join(', ');
    return Prototype.Selector.select(expression, document);
};

Prototype.Selector = (function() {

    function select() {
        throw new Error('Method "Prototype.Selector.select" must be defined.');
    }

    function match() {
        throw new Error('Method "Prototype.Selector.match" must be defined.');
    }

    function find(elements, expression, index) {
        index = index || 0;
        var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;

        for (i = 0; i < length; i++) {
            if (match(elements[i], expression) && index == matchIndex++) {
                return Element.extend(elements[i]);
            }
        }
    }

    function extendElements(elements) {
        for (var i = 0, length = elements.length; i < length; i++) {
            Element.extend(elements[i]);
        }
        return elements;
    }


    var K = Prototype.K;

    return {
        select: select,
        match: match,
        find: find,
        extendElements: (Element.extend === K) ? K : extendElements,
        extendElement: Element.extend
    };
})();
Prototype._original_property = window.Sizzle;
/*!
 * Sizzle CSS Selector Engine - v1.0
 *  Copyright 2009, The Dojo Foundation
 *  Released under the MIT, BSD, and GPL Licenses.
 *  More information: http://sizzlejs.com/
 */
(function() {

    var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^[\]]*\]|['"][^'"]*['"]|[^[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
            done = 0,
            toString = Object.prototype.toString,
            hasDuplicate = false,
            baseHasDuplicate = true;

    [0, 0].sort(function() {
        baseHasDuplicate = false;
        return 0;
    });

    var Sizzle = function(selector, context, results, seed) {
        results = results || [];
        var origContext = context = context || document;

        if (context.nodeType !== 1 && context.nodeType !== 9) {
            return [];
        }

        if (!selector || typeof selector !== "string") {
            return results;
        }

        var parts = [], m, set, checkSet, check, mode, extra, prune = true, contextXML = isXML(context),
                soFar = selector;

        while ((chunker.exec(""),m = chunker.exec(soFar)) !== null) {
            soFar = m[3];

            parts.push(m[1]);

            if (m[2]) {
                extra = m[3];
                break;
            }
        }

        if (parts.length > 1 && origPOS.exec(selector)) {
            if (parts.length === 2 && Expr.relative[ parts[0] ]) {
                set = posProcess(parts[0] + parts[1], context);
            } else {
                set = Expr.relative[ parts[0] ] ?
                        [ context ] :
                        Sizzle(parts.shift(), context);

                while (parts.length) {
                    selector = parts.shift();

                    if (Expr.relative[ selector ])
                        selector += parts.shift();

                    set = posProcess(selector, set);
                }
            }
        } else {
            if (!seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
                    Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1])) {
                var ret = Sizzle.find(parts.shift(), context, contextXML);
                context = ret.expr ? Sizzle.filter(ret.expr, ret.set)[0] : ret.set[0];
            }

            if (context) {
                var ret = seed ?
                { expr: parts.pop(), set: makeArray(seed) } :
                        Sizzle.find(parts.pop(), parts.length === 1 && (parts[0] === "~" || parts[0] === "+") && context.parentNode ? context.parentNode : context, contextXML);
                set = ret.expr ? Sizzle.filter(ret.expr, ret.set) : ret.set;

                if (parts.length > 0) {
                    checkSet = makeArray(set);
                } else {
                    prune = false;
                }

                while (parts.length) {
                    var cur = parts.pop(), pop = cur;

                    if (!Expr.relative[ cur ]) {
                        cur = "";
                    } else {
                        pop = parts.pop();
                    }

                    if (pop == null) {
                        pop = context;
                    }

                    Expr.relative[ cur ](checkSet, pop, contextXML);
                }
            } else {
                checkSet = parts = [];
            }
        }

        if (!checkSet) {
            checkSet = set;
        }

        if (!checkSet) {
            throw "Syntax error, unrecognized expression: " + (cur || selector);
        }

        if (toString.call(checkSet) === "[object Array]") {
            if (!prune) {
                results.push.apply(results, checkSet);
            } else if (context && context.nodeType === 1) {
                for (var i = 0; checkSet[i] != null; i++) {
                    if (checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i]))) {
                        results.push(set[i]);
                    }
                }
            } else {
                for (var i = 0; checkSet[i] != null; i++) {
                    if (checkSet[i] && checkSet[i].nodeType === 1) {
                        results.push(set[i]);
                    }
                }
            }
        } else {
            makeArray(checkSet, results);
        }

        if (extra) {
            Sizzle(extra, origContext, results, seed);
            Sizzle.uniqueSort(results);
        }

        return results;
    };

    Sizzle.uniqueSort = function(results) {
        if (sortOrder) {
            hasDuplicate = baseHasDuplicate;
            results.sort(sortOrder);

            if (hasDuplicate) {
                for (var i = 1; i < results.length; i++) {
                    if (results[i] === results[i - 1]) {
                        results.splice(i--, 1);
                    }
                }
            }
        }

        return results;
    };

    Sizzle.matches = function(expr, set) {
        return Sizzle(expr, null, null, set);
    };

    Sizzle.find = function(expr, context, isXML) {
        var set, match;

        if (!expr) {
            return [];
        }

        for (var i = 0, l = Expr.order.length; i < l; i++) {
            var type = Expr.order[i], match;

            if ((match = Expr.leftMatch[ type ].exec(expr))) {
                var left = match[1];
                match.splice(1, 1);

                if (left.substr(left.length - 1) !== "\\") {
                    match[1] = (match[1] || "").replace(/\\/g, "");
                    set = Expr.find[ type ](match, context, isXML);
                    if (set != null) {
                        expr = expr.replace(Expr.match[ type ], "");
                        break;
                    }
                }
            }
        }

        if (!set) {
            set = context.getElementsByTagName("*");
        }

        return {set: set, expr: expr};
    };

    Sizzle.filter = function(expr, set, inplace, not) {
        var old = expr, result = [], curLoop = set, match, anyFound,
                isXMLFilter = set && set[0] && isXML(set[0]);

        while (expr && set.length) {
            for (var type in Expr.filter) {
                if ((match = Expr.match[ type ].exec(expr)) != null) {
                    var filter = Expr.filter[ type ], found, item;
                    anyFound = false;

                    if (curLoop == result) {
                        result = [];
                    }

                    if (Expr.preFilter[ type ]) {
                        match = Expr.preFilter[ type ](match, curLoop, inplace, result, not, isXMLFilter);

                        if (!match) {
                            anyFound = found = true;
                        } else if (match === true) {
                            continue;
                        }
                    }

                    if (match) {
                        for (var i = 0; (item = curLoop[i]) != null; i++) {
                            if (item) {
                                found = filter(item, match, i, curLoop);
                                var pass = not ^ !!found;

                                if (inplace && found != null) {
                                    if (pass) {
                                        anyFound = true;
                                    } else {
                                        curLoop[i] = false;
                                    }
                                } else if (pass) {
                                    result.push(item);
                                    anyFound = true;
                                }
                            }
                        }
                    }

                    if (found !== undefined) {
                        if (!inplace) {
                            curLoop = result;
                        }

                        expr = expr.replace(Expr.match[ type ], "");

                        if (!anyFound) {
                            return [];
                        }

                        break;
                    }
                }
            }

            if (expr == old) {
                if (anyFound == null) {
                    throw "Syntax error, unrecognized expression: " + expr;
                } else {
                    break;
                }
            }

            old = expr;
        }

        return curLoop;
    };

    var Expr = Sizzle.selectors = {
        order: [ "ID", "NAME", "TAG" ],
        match: {
            ID: /#((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
            CLASS: /\.((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
            NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF-]|\\.)+)['"]*\]/,
            ATTR: /\[\s*((?:[\w\u00c0-\uFFFF-]|\\.)+)\s*(?:(\S?=)\s*(['"]*)(.*?)\3|)\s*\]/,
            TAG: /^((?:[\w\u00c0-\uFFFF\*-]|\\.)+)/,
            CHILD: /:(only|nth|last|first)-child(?:\((even|odd|[\dn+-]*)\))?/,
            POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^-]|$)/,
            PSEUDO: /:((?:[\w\u00c0-\uFFFF-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
        },
        leftMatch: {},
        attrMap: {
            "class": "className",
            "for": "htmlFor"
        },
        attrHandle: {
            href: function(elem) {
                return elem.getAttribute("href");
            }
        },
        relative: {
            "+": function(checkSet, part, isXML) {
                var isPartStr = typeof part === "string",
                        isTag = isPartStr && !/\W/.test(part),
                        isPartStrNotTag = isPartStr && !isTag;

                if (isTag && !isXML) {
                    part = part.toUpperCase();
                }

                for (var i = 0, l = checkSet.length, elem; i < l; i++) {
                    if ((elem = checkSet[i])) {
                        while ((elem = elem.previousSibling) && elem.nodeType !== 1) {
                        }

                        checkSet[i] = isPartStrNotTag || elem && elem.nodeName === part ?
                                elem || false :
                                elem === part;
                    }
                }

                if (isPartStrNotTag) {
                    Sizzle.filter(part, checkSet, true);
                }
            },
            ">": function(checkSet, part, isXML) {
                var isPartStr = typeof part === "string";

                if (isPartStr && !/\W/.test(part)) {
                    part = isXML ? part : part.toUpperCase();

                    for (var i = 0, l = checkSet.length; i < l; i++) {
                        var elem = checkSet[i];
                        if (elem) {
                            var parent = elem.parentNode;
                            checkSet[i] = parent.nodeName === part ? parent : false;
                        }
                    }
                } else {
                    for (var i = 0, l = checkSet.length; i < l; i++) {
                        var elem = checkSet[i];
                        if (elem) {
                            checkSet[i] = isPartStr ?
                                    elem.parentNode :
                                    elem.parentNode === part;
                        }
                    }

                    if (isPartStr) {
                        Sizzle.filter(part, checkSet, true);
                    }
                }
            },
            "": function(checkSet, part, isXML) {
                var doneName = done++, checkFn = dirCheck;

                if (!/\W/.test(part)) {
                    var nodeCheck = part = isXML ? part : part.toUpperCase();
                    checkFn = dirNodeCheck;
                }

                checkFn("parentNode", part, doneName, checkSet, nodeCheck, isXML);
            },
            "~": function(checkSet, part, isXML) {
                var doneName = done++, checkFn = dirCheck;

                if (typeof part === "string" && !/\W/.test(part)) {
                    var nodeCheck = part = isXML ? part : part.toUpperCase();
                    checkFn = dirNodeCheck;
                }

                checkFn("previousSibling", part, doneName, checkSet, nodeCheck, isXML);
            }
        },
        find: {
            ID: function(match, context, isXML) {
                if (typeof context.getElementById !== "undefined" && !isXML) {
                    var m = context.getElementById(match[1]);
                    return m ? [m] : [];
                }
            },
            NAME: function(match, context, isXML) {
                if (typeof context.getElementsByName !== "undefined") {
                    var ret = [], results = context.getElementsByName(match[1]);

                    for (var i = 0, l = results.length; i < l; i++) {
                        if (results[i].getAttribute("name") === match[1]) {
                            ret.push(results[i]);
                        }
                    }

                    return ret.length === 0 ? null : ret;
                }
            },
            TAG: function(match, context) {
                return context.getElementsByTagName(match[1]);
            }
        },
        preFilter: {
            CLASS: function(match, curLoop, inplace, result, not, isXML) {
                match = " " + match[1].replace(/\\/g, "") + " ";

                if (isXML) {
                    return match;
                }

                for (var i = 0, elem; (elem = curLoop[i]) != null; i++) {
                    if (elem) {
                        if (not ^ (elem.className && (" " + elem.className + " ").indexOf(match) >= 0)) {
                            if (!inplace)
                                result.push(elem);
                        } else if (inplace) {
                            curLoop[i] = false;
                        }
                    }
                }

                return false;
            },
            ID: function(match) {
                return match[1].replace(/\\/g, "");
            },
            TAG: function(match, curLoop) {
                for (var i = 0; curLoop[i] === false; i++) {
                }
                return curLoop[i] && isXML(curLoop[i]) ? match[1] : match[1].toUpperCase();
            },
            CHILD: function(match) {
                if (match[1] == "nth") {
                    var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
                            match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
                                    !/\D/.test(match[2]) && "0n+" + match[2] || match[2]);

                    match[2] = (test[1] + (test[2] || 1)) - 0;
                    match[3] = test[3] - 0;
                }

                match[0] = done++;

                return match;
            },
            ATTR: function(match, curLoop, inplace, result, not, isXML) {
                var name = match[1].replace(/\\/g, "");

                if (!isXML && Expr.attrMap[name]) {
                    match[1] = Expr.attrMap[name];
                }

                if (match[2] === "~=") {
                    match[4] = " " + match[4] + " ";
                }

                return match;
            },
            PSEUDO: function(match, curLoop, inplace, result, not) {
                if (match[1] === "not") {
                    if (( chunker.exec(match[3]) || "" ).length > 1 || /^\w/.test(match[3])) {
                        match[3] = Sizzle(match[3], null, null, curLoop);
                    } else {
                        var ret = Sizzle.filter(match[3], curLoop, inplace, true ^ not);
                        if (!inplace) {
                            result.push.apply(result, ret);
                        }
                        return false;
                    }
                } else if (Expr.match.POS.test(match[0]) || Expr.match.CHILD.test(match[0])) {
                    return true;
                }

                return match;
            },
            POS: function(match) {
                match.unshift(true);
                return match;
            }
        },
        filters: {
            enabled: function(elem) {
                return elem.disabled === false && elem.type !== "hidden";
            },
            disabled: function(elem) {
                return elem.disabled === true;
            },
            checked: function(elem) {
                return elem.checked === true;
            },
            selected: function(elem) {
                elem.parentNode.selectedIndex;
                return elem.selected === true;
            },
            parent: function(elem) {
                return !!elem.firstChild;
            },
            empty: function(elem) {
                return !elem.firstChild;
            },
            has: function(elem, i, match) {
                return !!Sizzle(match[3], elem).length;
            },
            header: function(elem) {
                return /h\d/i.test(elem.nodeName);
            },
            text: function(elem) {
                return "text" === elem.type;
            },
            radio: function(elem) {
                return "radio" === elem.type;
            },
            checkbox: function(elem) {
                return "checkbox" === elem.type;
            },
            file: function(elem) {
                return "file" === elem.type;
            },
            password: function(elem) {
                return "password" === elem.type;
            },
            submit: function(elem) {
                return "submit" === elem.type;
            },
            image: function(elem) {
                return "image" === elem.type;
            },
            reset: function(elem) {
                return "reset" === elem.type;
            },
            button: function(elem) {
                return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
            },
            input: function(elem) {
                return /input|select|textarea|button/i.test(elem.nodeName);
            }
        },
        setFilters: {
            first: function(elem, i) {
                return i === 0;
            },
            last: function(elem, i, match, array) {
                return i === array.length - 1;
            },
            even: function(elem, i) {
                return i % 2 === 0;
            },
            odd: function(elem, i) {
                return i % 2 === 1;
            },
            lt: function(elem, i, match) {
                return i < match[3] - 0;
            },
            gt: function(elem, i, match) {
                return i > match[3] - 0;
            },
            nth: function(elem, i, match) {
                return match[3] - 0 == i;
            },
            eq: function(elem, i, match) {
                return match[3] - 0 == i;
            }
        },
        filter: {
            PSEUDO: function(elem, match, i, array) {
                var name = match[1], filter = Expr.filters[ name ];

                if (filter) {
                    return filter(elem, i, match, array);
                } else if (name === "contains") {
                    return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
                } else if (name === "not") {
                    var not = match[3];

                    for (var i = 0, l = not.length; i < l; i++) {
                        if (not[i] === elem) {
                            return false;
                        }
                    }

                    return true;
                }
            },
            CHILD: function(elem, match) {
                var type = match[1], node = elem;
                switch (type) {
                    case 'only':
                    case 'first':
                        while ((node = node.previousSibling)) {
                            if (node.nodeType === 1) return false;
                        }
                        if (type == 'first') return true;
                        node = elem;
                    case 'last':
                        while ((node = node.nextSibling)) {
                            if (node.nodeType === 1) return false;
                        }
                        return true;
                    case 'nth':
                        var first = match[2], last = match[3];

                        if (first == 1 && last == 0) {
                            return true;
                        }

                        var doneName = match[0],
                                parent = elem.parentNode;

                        if (parent && (parent.sizcache !== doneName || !elem.nodeIndex)) {
                            var count = 0;
                            for (node = parent.firstChild; node; node = node.nextSibling) {
                                if (node.nodeType === 1) {
                                    node.nodeIndex = ++count;
                                }
                            }
                            parent.sizcache = doneName;
                        }

                        var diff = elem.nodeIndex - last;
                        if (first == 0) {
                            return diff == 0;
                        } else {
                            return ( diff % first == 0 && diff / first >= 0 );
                        }
                }
            },
            ID: function(elem, match) {
                return elem.nodeType === 1 && elem.getAttribute("id") === match;
            },
            TAG: function(elem, match) {
                return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
            },
            CLASS: function(elem, match) {
                return (" " + (elem.className || elem.getAttribute("class")) + " ")
                        .indexOf(match) > -1;
            },
            ATTR: function(elem, match) {
                var name = match[1],
                        result = Expr.attrHandle[ name ] ?
                                Expr.attrHandle[ name ](elem) :
                                elem[ name ] != null ?
                                        elem[ name ] :
                                        elem.getAttribute(name),
                        value = result + "",
                        type = match[2],
                        check = match[4];

                return result == null ?
                        type === "!=" :
                        type === "=" ?
                                value === check :
                                type === "*=" ?
                                        value.indexOf(check) >= 0 :
                                        type === "~=" ?
                                                (" " + value + " ").indexOf(check) >= 0 :
                                                !check ?
                                                        value && result !== false :
                                                        type === "!=" ?
                                                                value != check :
                                                                type === "^=" ?
                                                                        value.indexOf(check) === 0 :
                                                                        type === "$=" ?
                                                                                value.substr(value.length - check.length) === check :
                                                                                type === "|=" ?
                                                                                        value === check || value.substr(0, check.length + 1) === check + "-" :
                                                                                        false;
            },
            POS: function(elem, match, i, array) {
                var name = match[2], filter = Expr.setFilters[ name ];

                if (filter) {
                    return filter(elem, i, match, array);
                }
            }
        }
    };

    var origPOS = Expr.match.POS;

    for (var type in Expr.match) {
        Expr.match[ type ] = new RegExp(Expr.match[ type ].source + /(?![^\[]*\])(?![^\(]*\))/.source);
        Expr.leftMatch[ type ] = new RegExp(/(^(?:.|\r|\n)*?)/.source + Expr.match[ type ].source);
    }

    var makeArray = function(array, results) {
        array = Array.prototype.slice.call(array, 0);

        if (results) {
            results.push.apply(results, array);
            return results;
        }

        return array;
    };

    try {
        Array.prototype.slice.call(document.documentElement.childNodes, 0);

    } catch(e) {
        makeArray = function(array, results) {
            var ret = results || [];

            if (toString.call(array) === "[object Array]") {
                Array.prototype.push.apply(ret, array);
            } else {
                if (typeof array.length === "number") {
                    for (var i = 0, l = array.length; i < l; i++) {
                        ret.push(array[i]);
                    }
                } else {
                    for (var i = 0; array[i]; i++) {
                        ret.push(array[i]);
                    }
                }
            }

            return ret;
        };
    }

    var sortOrder;

    if (document.documentElement.compareDocumentPosition) {
        sortOrder = function(a, b) {
            if (!a.compareDocumentPosition || !b.compareDocumentPosition) {
                if (a == b) {
                    hasDuplicate = true;
                }
                return 0;
            }

            var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
            if (ret === 0) {
                hasDuplicate = true;
            }
            return ret;
        };
    } else if ("sourceIndex" in document.documentElement) {
        sortOrder = function(a, b) {
            if (!a.sourceIndex || !b.sourceIndex) {
                if (a == b) {
                    hasDuplicate = true;
                }
                return 0;
            }

            var ret = a.sourceIndex - b.sourceIndex;
            if (ret === 0) {
                hasDuplicate = true;
            }
            return ret;
        };
    } else if (document.createRange) {
        sortOrder = function(a, b) {
            if (!a.ownerDocument || !b.ownerDocument) {
                if (a == b) {
                    hasDuplicate = true;
                }
                return 0;
            }

            var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
            aRange.setStart(a, 0);
            aRange.setEnd(a, 0);
            bRange.setStart(b, 0);
            bRange.setEnd(b, 0);
            var ret = aRange.compareBoundaryPoints(Range.START_TO_END, bRange);
            if (ret === 0) {
                hasDuplicate = true;
            }
            return ret;
        };
    }

    (function() {
        var form = document.createElement("div"),
                id = "script" + (new Date).getTime();
        form.innerHTML = "<a name='" + id + "'/>";

        var root = document.documentElement;
        root.insertBefore(form, root.firstChild);

        if (!!document.getElementById(id)) {
            Expr.find.ID = function(match, context, isXML) {
                if (typeof context.getElementById !== "undefined" && !isXML) {
                    var m = context.getElementById(match[1]);
                    return m ? m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
                }
            };

            Expr.filter.ID = function(elem, match) {
                var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
                return elem.nodeType === 1 && node && node.nodeValue === match;
            };
        }

        root.removeChild(form);
        root = form = null; // release memory in IE
    })();

    (function() {

        var div = document.createElement("div");
        div.appendChild(document.createComment(""));

        if (div.getElementsByTagName("*").length > 0) {
            Expr.find.TAG = function(match, context) {
                var results = context.getElementsByTagName(match[1]);

                if (match[1] === "*") {
                    var tmp = [];

                    for (var i = 0; results[i]; i++) {
                        if (results[i].nodeType === 1) {
                            tmp.push(results[i]);
                        }
                    }

                    results = tmp;
                }

                return results;
            };
        }

        div.innerHTML = "<a href='#'></a>";
        if (div.firstChild && typeof div.firstChild.getAttribute !== "undefined" &&
                div.firstChild.getAttribute("href") !== "#") {
            Expr.attrHandle.href = function(elem) {
                return elem.getAttribute("href", 2);
            };
        }

        div = null; // release memory in IE
    })();

    if (document.querySelectorAll) (function() {
        var oldSizzle = Sizzle, div = document.createElement("div");
        div.innerHTML = "<p class='TEST'></p>";

        if (div.querySelectorAll && div.querySelectorAll(".TEST").length === 0) {
            return;
        }

        Sizzle = function(query, context, extra, seed) {
            context = context || document;

            if (!seed && context.nodeType === 9 && !isXML(context)) {
                try {
                    return makeArray(context.querySelectorAll(query), extra);
                } catch(e) {
                }
            }

            return oldSizzle(query, context, extra, seed);
        };

        for (var prop in oldSizzle) {
            Sizzle[ prop ] = oldSizzle[ prop ];
        }

        div = null; // release memory in IE
    })();

    if (document.getElementsByClassName && document.documentElement.getElementsByClassName) (function() {
        var div = document.createElement("div");
        div.innerHTML = "<div class='test e'></div><div class='test'></div>";

        if (div.getElementsByClassName("e").length === 0)
            return;

        div.lastChild.className = "e";

        if (div.getElementsByClassName("e").length === 1)
            return;

        Expr.order.splice(1, 0, "CLASS");
        Expr.find.CLASS = function(match, context, isXML) {
            if (typeof context.getElementsByClassName !== "undefined" && !isXML) {
                return context.getElementsByClassName(match[1]);
            }
        };

        div = null; // release memory in IE
    })();

    function dirNodeCheck(dir, cur, doneName, checkSet, nodeCheck, isXML) {
        var sibDir = dir == "previousSibling" && !isXML;
        for (var i = 0, l = checkSet.length; i < l; i++) {
            var elem = checkSet[i];
            if (elem) {
                if (sibDir && elem.nodeType === 1) {
                    elem.sizcache = doneName;
                    elem.sizset = i;
                }
                elem = elem[dir];
                var match = false;

                while (elem) {
                    if (elem.sizcache === doneName) {
                        match = checkSet[elem.sizset];
                        break;
                    }

                    if (elem.nodeType === 1 && !isXML) {
                        elem.sizcache = doneName;
                        elem.sizset = i;
                    }

                    if (elem.nodeName === cur) {
                        match = elem;
                        break;
                    }

                    elem = elem[dir];
                }

                checkSet[i] = match;
            }
        }
    }

    function dirCheck(dir, cur, doneName, checkSet, nodeCheck, isXML) {
        var sibDir = dir == "previousSibling" && !isXML;
        for (var i = 0, l = checkSet.length; i < l; i++) {
            var elem = checkSet[i];
            if (elem) {
                if (sibDir && elem.nodeType === 1) {
                    elem.sizcache = doneName;
                    elem.sizset = i;
                }
                elem = elem[dir];
                var match = false;

                while (elem) {
                    if (elem.sizcache === doneName) {
                        match = checkSet[elem.sizset];
                        break;
                    }

                    if (elem.nodeType === 1) {
                        if (!isXML) {
                            elem.sizcache = doneName;
                            elem.sizset = i;
                        }
                        if (typeof cur !== "string") {
                            if (elem === cur) {
                                match = true;
                                break;
                            }

                        } else if (Sizzle.filter(cur, [elem]).length > 0) {
                            match = elem;
                            break;
                        }
                    }

                    elem = elem[dir];
                }

                checkSet[i] = match;
            }
        }
    }

    var contains = document.compareDocumentPosition ? function(a, b) {
        return a.compareDocumentPosition(b) & 16;
    } : function(a, b) {
        return a !== b && (a.contains ? a.contains(b) : true);
    };

    var isXML = function(elem) {
        return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
                !!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
    };

    var posProcess = function(selector, context) {
        var tmpSet = [], later = "", match,
                root = context.nodeType ? [context] : context;

        while ((match = Expr.match.PSEUDO.exec(selector))) {
            later += match[0];
            selector = selector.replace(Expr.match.PSEUDO, "");
        }

        selector = Expr.relative[selector] ? selector + "*" : selector;

        for (var i = 0, l = root.length; i < l; i++) {
            Sizzle(selector, root[i], tmpSet);
        }

        return Sizzle.filter(later, tmpSet);
    };


    window.Sizzle = Sizzle;

})();

(function(engine) {
    var extendElements = Prototype.Selector.extendElements;

    function select(selector, scope) {
        return extendElements(engine(selector, scope || document));
    }

    function match(element, selector) {
        return engine.matches(selector, [element]).length == 1;
    }

    Prototype.Selector.engine = engine;
    Prototype.Selector.select = select;
    Prototype.Selector.match = match;
})(Sizzle);

window.Sizzle = Prototype._original_property;
delete Prototype._original_property;

var Form = {
    reset: function(form) {
        form = $(form);
        form.reset();
        return form;
    },

    serializeElements: function(elements, options) {
        if (typeof options != 'object') options = { hash: !!options };
        else if (Object.isUndefined(options.hash)) options.hash = true;
        var key, value, submitted = false, submit = options.submit, accumulator, initial;

        if (options.hash) {
            initial = {};
            accumulator = function(result, key, value) {
                if (key in result) {
                    if (!Object.isArray(result[key])) result[key] = [result[key]];
                    result[key].push(value);
                } else result[key] = value;
                return result;
            };
        } else {
            initial = '';
            accumulator = function(result, key, value) {
                return result + (result ? '&' : '') + encodeURIComponent(key) + '=' + encodeURIComponent(value);
            }
        }

        return elements.inject(initial, function(result, element) {
            if (!element.disabled && element.name) {
                key = element.name;
                value = $(element).getValue();
                if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
                        submit !== false && (!submit || key == submit) && (submitted = true)))) {
                    result = accumulator(result, key, value);
                }
            }
            return result;
        });
    }
};

Form.Methods = {
    serialize: function(form, options) {
        return Form.serializeElements(Form.getElements(form), options);
    },

    getElements: function(form) {
        var elements = $(form).getElementsByTagName('*'),
                element,
                arr = [ ],
                serializers = Form.Element.Serializers;
        for (var i = 0; element = elements[i]; i++) {
            arr.push(element);
        }
        return arr.inject([], function(elements, child) {
            if (serializers[child.tagName.toLowerCase()])
                elements.push(Element.extend(child));
            return elements;
        })
    },

    getInputs: function(form, typeName, name) {
        form = $(form);
        var inputs = form.getElementsByTagName('input');

        if (!typeName && !name) return $A(inputs).mapWith(Element.extend);

        for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
            var input = inputs[i];
            if ((typeName && input.type != typeName) || (name && input.name != name))
                continue;
            matchingInputs.push(Element.extend(input));
        }

        return matchingInputs;
    },

    disable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('disable');
        return form;
    },

    enable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('enable');
        return form;
    },

    findFirstElement: function(form) {
        var elements = $(form).getElements().findAll(function(element) {
            return 'hidden' != element.type && !element.disabled;
        });
        var firstByIndex = elements.findAll(
                function(element) {
                    return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
                }).sortBy(
                function(element) {
                    return element.tabIndex
                }).first();

        return firstByIndex ? firstByIndex : elements.find(function(element) {
            return /^(?:input|select|textarea)$/i.test(element.tagName);
        });
    },

    focusFirstElement: function(form) {
        form = $(form);
        var element = form.findFirstElement();
        if (element) element.activate();
        return form;
    },

    request: function(form, options) {
        form = $(form),options = Object.clone(options || { });

        var params = options.parameters, action = form.readAttribute('action') || '';
        if (action.blank()) action = window.location.href;
        options.parameters = form.serialize(true);

        if (params) {
            if (Object.isString(params)) params = params.toQueryParams();
            Object.extend(options.parameters, params);
        }

        if (form.hasAttribute('method') && !options.method)
            options.method = form.method;

        return new Ajax.Request(action, options);
    }
};

/*--------------------------------------------------------------------------*/


Form.Element = {
    focus: function(element) {
        $(element).focus();
        return element;
    },

    select: function(element) {
        $(element).select();
        return element;
    }
};

Form.Element.Methods = {

    serialize: function(element) {
        element = $(element);
        if (!element.disabled && element.name) {
            var value = element.getValue();
            if (value != undefined) {
                var pair = { };
                pair[element.name] = value;
                return Object.toQueryString(pair);
            }
        }
        return '';
    },

    getValue: function(element) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        return Form.Element.Serializers[method](element);
    },

    setValue: function(element, value) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        Form.Element.Serializers[method](element, value);
        return element;
    },

    clear: function(element) {
        $(element).value = '';
        return element;
    },

    present: function(element) {
        return $(element).value != '';
    },

    activate: function(element) {
        element = $(element);
        try {
            element.focus();
            if (element.select && (element.tagName.toLowerCase() != 'input' ||
                    !(/^(?:button|reset|submit)$/i.test(element.type))))
                element.select();
        } catch (e) {
        }
        return element;
    },

    disable: function(element) {
        element = $(element);
        element.disabled = true;
        return element;
    },

    enable: function(element) {
        element = $(element);
        element.disabled = false;
        return element;
    }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;

var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = (function() {
    function input(element, value) {
        switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
                return inputSelector(element, value);
            default:
                return valueSelector(element, value);
        }
    }

    function inputSelector(element, value) {
        if (Object.isUndefined(value))
            return element.checked ? element.value : null;
        else element.checked = !!value;
    }

    function valueSelector(element, value) {
        if (Object.isUndefined(value)) return element.value;
        else element.value = value;
    }

    function select(element, value) {
        if (Object.isUndefined(value))
            return (element.type === 'select-one' ? selectOne : selectMany)(element);

        var opt, currentValue, single = !Object.isArray(value);
        for (var i = 0, length = element.length; i < length; i++) {
            opt = element.options[i];
            currentValue = this.optionValue(opt);
            if (single) {
                if (currentValue == value) {
                    opt.selected = true;
                    return;
                }
            }
            else opt.selected = value.include(currentValue);
        }
    }

    function selectOne(element) {
        var index = element.selectedIndex;
        return index >= 0 ? optionValue(element.options[index]) : null;
    }

    function selectMany(element) {
        var values, length = element.length;
        if (!length) return null;

        for (var i = 0, values = []; i < length; i++) {
            var opt = element.options[i];
            if (opt.selected) values.push(optionValue(opt));
        }
        return values;
    }

    function optionValue(opt) {
        return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
    }

    return {
        input:         input,
        inputSelector: inputSelector,
        textarea:      valueSelector,
        select:        select,
        selectOne:     selectOne,
        selectMany:    selectMany,
        optionValue:   optionValue,
        button:        valueSelector
    };
})();

/*--------------------------------------------------------------------------*/


Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
    initialize: function($super, element, frequency, callback) {
        $super(callback, frequency);
        this.element = $(element);
        this.lastValue = this.getValue();
    },

    execute: function() {
        var value = this.getValue();
        if (Object.isString(this.lastValue) && Object.isString(value) ?
                this.lastValue != value : String(this.lastValue) != String(value)) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
    initialize: function(element, callback) {
        this.element = $(element);
        this.callback = callback;

        this.lastValue = this.getValue();
        if (this.element.tagName.toLowerCase() == 'form')
            this.registerFormCallbacks();
        else
            this.registerCallback(this.element);
    },

    onElementEvent: function() {
        var value = this.getValue();
        if (this.lastValue != value) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    },

    registerFormCallbacks: function() {
        Form.getElements(this.element).each(this.registerCallback, this);
    },

    registerCallback: function(element) {
        if (element.type) {
            switch (element.type.toLowerCase()) {
                case 'checkbox':
                case 'radio':
                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                    break;
                default:
                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                    break;
            }
        }
    }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});
(function() {

    var Event = {
        KEY_BACKSPACE: 8,
        KEY_TAB:       9,
        KEY_RETURN:   13,
        KEY_ESC:      27,
        KEY_LEFT:     37,
        KEY_UP:       38,
        KEY_RIGHT:    39,
        KEY_DOWN:     40,
        KEY_DELETE:   46,
        KEY_HOME:     36,
        KEY_END:      35,
        KEY_PAGEUP:   33,
        KEY_PAGEDOWN: 34,
        KEY_INSERT:   45,

        cache: {}
    };

    var docEl = document.documentElement;
    var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
            && 'onmouseleave' in docEl;


    var isIELegacyEvent = function(event) {
        return false;
    };

    if (window.attachEvent) {
        if (window.addEventListener) {
            isIELegacyEvent = function(event) {
                return !(event instanceof window.Event);
            };
        } else {
            isIELegacyEvent = function(event) {
                return true;
            };
        }
    }

    var _isButton;

    function _isButtonForDOMEvents(event, code) {
        return event.which ? (event.which === code + 1) : (event.button === code);
    }

    var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };

    function _isButtonForLegacyEvents(event, code) {
        return event.button === legacyButtonMap[code];
    }

    function _isButtonForWebKit(event, code) {
        switch (code) {
            case 0: return event.which == 1 && !event.metaKey;
            case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
            case 2: return event.which == 3;
            default: return false;
        }
    }

    if (window.attachEvent) {
        if (!window.addEventListener) {
            _isButton = _isButtonForLegacyEvents;
        } else {
            _isButton = function(event, code) {
                return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
                        _isButtonForDOMEvents(event, code);
            }
        }
    } else if (Prototype.Browser.WebKit) {
        _isButton = _isButtonForWebKit;
    } else {
        _isButton = _isButtonForDOMEvents;
    }

    function isLeftClick(event) {
        return _isButton(event, 0)
    }

    function isMiddleClick(event) {
        return _isButton(event, 1)
    }

    function isRightClick(event) {
        return _isButton(event, 2)
    }

    function element(event) {
        event = Event.extend(event);

        var node = event.target, type = event.type,
                currentTarget = event.currentTarget;

        if (currentTarget && currentTarget.tagName) {
            if (type === 'load' || type === 'error' ||
                    (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
                            && currentTarget.type === 'radio'))
                node = currentTarget;
        }

        if (node.nodeType == Node.TEXT_NODE)
            node = node.parentNode;

        return Element.extend(node);
    }

    function findElement(event, expression) {
        var element = Event.element(event);

        if (!expression) return element;
        while (element) {
            if (Object.isElement(element) && Prototype.Selector.match(element, expression)) {
                return Element.extend(element);
            }
            element = element.parentNode;
        }
    }

    function pointer(event) {
        return { x: pointerX(event), y: pointerY(event) };
    }

    function pointerX(event) {
        var docElement = document.documentElement,
                body = document.body || { scrollLeft: 0 };

        return event.pageX || (event.clientX +
                (docElement.scrollLeft || body.scrollLeft) -
                (docElement.clientLeft || 0));
    }

    function pointerY(event) {
        var docElement = document.documentElement,
                body = document.body || { scrollTop: 0 };

        return  event.pageY || (event.clientY +
                (docElement.scrollTop || body.scrollTop) -
                (docElement.clientTop || 0));
    }


    function stop(event) {
        Event.extend(event);
        event.preventDefault();
        event.stopPropagation();

        event.stopped = true;
    }


    Event.Methods = {
        isLeftClick:   isLeftClick,
        isMiddleClick: isMiddleClick,
        isRightClick:  isRightClick,

        element:     element,
        findElement: findElement,

        pointer:  pointer,
        pointerX: pointerX,
        pointerY: pointerY,

        stop: stop
    };

    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
        m[name] = Event.Methods[name].methodize();
        return m;
    });

    if (window.attachEvent) {
        function _relatedTarget(event) {
            var element;
            switch (event.type) {
                case 'mouseover':
                case 'mouseenter':
                    element = event.fromElement;
                    break;
                case 'mouseout':
                case 'mouseleave':
                    element = event.toElement;
                    break;
                default:
                    return null;
            }
            return Element.extend(element);
        }

        var additionalMethods = {
            stopPropagation: function() {
                this.cancelBubble = true
            },
            preventDefault:  function() {
                this.returnValue = false
            },
            inspect: function() {
                return '[object Event]'
            }
        };

        Event.extend = function(event, element) {
            if (!event) return false;

            if (!isIELegacyEvent(event)) return event;

            if (event._extendedByPrototype) return event;
            event._extendedByPrototype = Prototype.emptyFunction;

            var pointer = Event.pointer(event);

            Object.extend(event, {
                target: event.srcElement || element,
                relatedTarget: _relatedTarget(event),
                pageX:  pointer.x,
                pageY:  pointer.y
            });

            Object.extend(event, methods);
            Object.extend(event, additionalMethods);

            return event;
        };
    } else {
        Event.extend = Prototype.K;
    }

    if (window.addEventListener) {
        Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
        Object.extend(Event.prototype, methods);
    }

    function _createResponder(element, eventName, handler) {
        var registry = Element.retrieve(element, 'prototype_event_registry');

        if (Object.isUndefined(registry)) {
            registry = Element.retrieve(element, 'prototype_event_registry', $H());
            CACHE[element._prototypeUID || 0] = element;
        }

        var respondersForEvent = registry.get(eventName);
        if (Object.isUndefined(respondersForEvent)) {
            respondersForEvent = [];
            registry.set(eventName, respondersForEvent);
        }

        if (respondersForEvent.pluck('handler').include(handler)) return false;

        var responder;
        if (eventName.include(":")) {
            responder = function(event) {
                if (Object.isUndefined(event.eventName))
                    return false;

                if (event.eventName !== eventName)
                    return false;

                Event.extend(event, element);
                handler.call(element, event);
            };
        } else {
            if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
                    (eventName === "mouseenter" || eventName === "mouseleave")) {
                if (eventName === "mouseenter" || eventName === "mouseleave") {
                    responder = function(event) {
                        Event.extend(event, element);

                        var parent = event.relatedTarget;
                        while (parent && parent !== element) {
                            try {
                                parent = parent.parentNode;
                            }
                            catch(e) {
                                parent = element;
                            }
                        }

                        if (parent === element) return;

                        handler.call(element, event);
                    };
                }
            } else {
                responder = function(event) {
                    Event.extend(event, element);
                    handler.call(element, event);
                };
            }
        }

        responder.handler = handler;
        respondersForEvent.push(responder);
        return responder;
    }

    function _destroyCache() {
        for (var key in CACHE) {
            Event.stopObserving(CACHE[key]);
        }
        CACHE = {};
    }

    var CACHE = {};

    if (Prototype.Browser.IE)
        window.attachEvent('onunload', _destroyCache);

    if (Prototype.Browser.WebKit)
        window.addEventListener('unload', Prototype.emptyFunction, false);


    var _getDOMEventName = Prototype.K,
            translations = { mouseenter: "mouseover", mouseleave: "mouseout" };

    if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED) {
        _getDOMEventName = function(eventName) {
            return (translations[eventName] || eventName);
        };
    }

    function observe(element, eventName, handler) {
        element = $(element);

        var responder = _createResponder(element, eventName, handler);

        if (!responder) return element;

        if (eventName.include(':')) {
            if (element.addEventListener)
                element.addEventListener("dataavailable", responder, false);
            else {
                element.attachEvent("ondataavailable", responder);
                element.attachEvent("onlosecapture", responder);
            }
        } else {
            var actualEventName = _getDOMEventName(eventName);

            if (element.addEventListener)
                element.addEventListener(actualEventName, responder, false);
            else
                element.attachEvent("on" + actualEventName, responder);
        }

        return element;
    }

    function stopObserving(element, eventName, handler) {
        element = $(element);

        var registry = Element.retrieve(element, 'prototype_event_registry');
        if (!registry) return element;

        if (!eventName) {
            registry.each(function(pair) {
                var eventName = pair.key;
                stopObserving(element, eventName);
            });
            return element;
        }

        var responders = registry.get(eventName);
        if (!responders) return element;

        if (!handler) {
            responders.each(function(r) {
                stopObserving(element, eventName, r.handler);
            });
            return element;
        }

        var i = responders.length, responder;
        while (i--) {
            if (responders[i].handler === handler) {
                responder = responders[i];
                break;
            }
        }
        if (!responder) return element;

        if (eventName.include(':')) {
            if (element.removeEventListener)
                element.removeEventListener("dataavailable", responder, false);
            else {
                element.detachEvent("ondataavailable", responder);
                element.detachEvent("onlosecapture", responder);
            }
        } else {
            var actualEventName = _getDOMEventName(eventName);
            if (element.removeEventListener)
                element.removeEventListener(actualEventName, responder, false);
            else
                element.detachEvent('on' + actualEventName, responder);
        }

        var remaining_responders = responders.without(responder);
        if (remaining_responders.length > 0) {
            registry.set(eventName, remaining_responders);
        }
        else {
            registry.unset(eventName);
            if (registry.size() == 0) {
                  // to prevent memory leak!
                  delete CACHE[element._prototypeUID || 0];
                  // to ensure element will be re-added to CACHE in case of new Event.observe:
                  Element.getStorage(element).unset('prototype_event_registry');
            }
        }

        return element;
    }

    function fire(element, eventName, memo, bubble) {
        element = $(element);

        if (Object.isUndefined(bubble))
            bubble = true;

        if (element == document && document.createEvent && !element.dispatchEvent)
            element = document.documentElement;

        var event;
        if (document.createEvent) {
            event = document.createEvent('HTMLEvents');
            event.initEvent('dataavailable', bubble, true);
        } else {
            event = document.createEventObject();
            event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';
        }

        event.eventName = eventName;
        event.memo = memo || { };

        if (document.createEvent)
            element.dispatchEvent(event);
        else
            element.fireEvent(event.eventType, event);

        return Event.extend(event);
    }

    Event.Handler = Class.create({
        initialize: function(element, eventName, selector, callback) {
            this.element = $(element);
            this.eventName = eventName;
            this.selector = selector;
            this.callback = callback;
            this.handler = this.handleEvent.bind(this);
        },

        start: function() {
            Event.observe(this.element, this.eventName, this.handler);
            return this;
        },

        stop: function() {
            Event.stopObserving(this.element, this.eventName, this.handler);
            return this;
        },

        handleEvent: function(event) {
            var element = Event.findElement(event, this.selector);
            if (element) this.callback.call(this.element, event, element);
        }
    });

    function on(element, eventName, selector, callback) {
        element = $(element);
        if (Object.isFunction(selector) && Object.isUndefined(callback)) {
            callback = selector,selector = null;
        }

        return new Event.Handler(element, eventName, selector, callback).start();
    }

    Object.extend(Event, Event.Methods);

    Object.extend(Event, {
        fire:          fire,
        observe:       observe,
        stopObserving: stopObserving,
        prototype_on:            on
    });

    Element.addMethods({
        fire:          fire,

        observe:       observe,

        stopObserving: stopObserving,

        prototype_on:            on
    });

    Object.extend(document, {
        fire:          fire.methodize(),

        observe:       observe.methodize(),

        stopObserving: stopObserving.methodize(),

        prototype_on:            on.methodize(),

        loaded:        false
    });

    if (window.Event) Object.extend(window.Event, Event);
    else window.Event = Event;
})();

(function() {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */

    var timer;

    function fireContentLoadedEvent() {
        if (document.loaded) return;
        if (timer) window.clearTimeout(timer);
        document.loaded = true;
        document.fire('dom:loaded');
    }

    function checkReadyState() {
        if (document.readyState === 'complete') {
            document.stopObserving('readystatechange', checkReadyState);
            fireContentLoadedEvent();
        }
    }

    function pollDoScroll() {
        try {
            document.documentElement.doScroll('left');
        }
        catch(e) {
            timer = pollDoScroll.defer();
            return;
        }
        fireContentLoadedEvent();
    }

    if (document.addEventListener) {
        document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
    } else {
        document.observe('readystatechange', checkReadyState);
        if (window == top)
            timer = pollDoScroll.defer();
    }

    Event.observe(window, 'load', fireContentLoadedEvent);
})();

Element.addMethods();

/*------------------------------- DEPRECATED -------------------------------*/

Hashtable.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
    Before: function(element, content) {
        return Element.insert(element, {before:content});
    },

    Top: function(element, content) {
        return Element.insert(element, {top:content});
    },

    Bottom: function(element, content) {
        return Element.insert(element, {bottom:content});
    },

    After: function(element, content) {
        return Element.insert(element, {after:content});
    }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

var Position = {
    includeScrollOffsets: false,

    prepare: function() {
        this.deltaX = window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
        this.deltaY = window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
    },

    within: function(element, x, y) {
        if (this.includeScrollOffsets)
            return this.withinIncludingScrolloffsets(element, x, y);
        this.xcomp = x;
        this.ycomp = y;
        this.offset = Element.cumulativeOffset(element);

        return (y >= this.offset[1] &&
                y < this.offset[1] + element.offsetHeight &&
                x >= this.offset[0] &&
                x < this.offset[0] + element.offsetWidth);
    },

    withinIncludingScrolloffsets: function(element, x, y) {
        var offsetcache = Element.cumulativeScrollOffset(element);

        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = Element.cumulativeOffset(element);

        return (this.ycomp >= this.offset[1] &&
                this.ycomp < this.offset[1] + element.offsetHeight &&
                this.xcomp >= this.offset[0] &&
                this.xcomp < this.offset[0] + element.offsetWidth);
    },

    overlap: function(mode, element) {
        if (!mode) return 0;
        if (mode == 'vertical')
            return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
                    element.offsetHeight;
        if (mode == 'horizontal')
            return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
                    element.offsetWidth;
    },


    cumulativeOffset: Element.Methods.cumulativeOffset,

    positionedOffset: Element.Methods.positionedOffset,

    absolutize: function(element) {
        Position.prepare();
        return Element.absolutize(element);
    },

    relativize: function(element) {
        Position.prepare();
        return Element.relativize(element);
    },

    realOffset: Element.Methods.cumulativeScrollOffset,

    offsetParent: Element.Methods.getOffsetParent,

    page: Element.Methods.viewportOffset,

    clone: function(source, target, options) {
        options = options || { };
        return Element.clonePosition(target, source, options);
    }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods) {
    function iter(name) {
        return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
    }

    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
            function(element, className) {
                className = className.toString().strip();
                var cond = /\s/.test(className) ? $w(className).mapWith(iter).join('') : iter(className);
                return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
            } : function(element, className) {
                className = className.toString().strip();
                var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
                if (!classNames && !className) return elements;

                var nodes = $(element).getElementsByTagName('*');
                className = ' ' + className + ' ';

                for (var i = 0, child, cn; child = nodes[i]; i++) {
                    if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
                            (classNames && classNames.all(function(name) {
                                return !name.toString().blank() && cn.include(' ' + name + ' ');
                            }))))
                        elements.push(Element.extend(child));
                }
                return elements;
            };

    return function(className, parentElement) {
        return $(parentElement || document.body).getElementsByClassName(className);
    };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
    initialize: function(element) {
        this.element = $(element);
    },

    _each: function(iterator) {
        this.element.className.split(/\s+/).select(
                function(name) {
                    return name.length > 0;
                })._each(iterator);
    },

    set: function(className) {
        this.element.className = className;
    },

    add: function(classNameToAdd) {
        if (this.include(classNameToAdd)) return;
        this.set($A(this).concat(classNameToAdd).join(' '));
    },

    remove: function(classNameToRemove) {
        if (!this.include(classNameToRemove)) return;
        this.set($A(this).without(classNameToRemove).join(' '));
    },

    toString: function() {
        return $A(this).join(' ');
    }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

(function() {
    window.Selector = Class.create({
        initialize: function(expression) {
            this.expression = expression.strip();
        },

        findElements: function(rootElement) {
            return Prototype.Selector.select(this.expression, rootElement);
        },

        match: function(element) {
            return Prototype.Selector.match(element, this.expression);
        },

        toString: function() {
            return this.expression;
        },

        inspect: function() {
            return "#<Selector: " + this.expression + ">";
        }
    });

    Object.extend(Selector, {
        matchElements: function(elements, expression) {
            var match = Prototype.Selector.match,
                    results = [];

            for (var i = 0, length = elements.length; i < length; i++) {
                var element = elements[i];
                if (match(element, expression)) {
                    results.push(Element.extend(element));
                }
            }
            return results;
        },

        findElement: function(elements, expression, index) {
            index = index || 0;
            var matchIndex = 0, element;
            for (var i = 0, length = elements.length; i < length; i++) {
                element = elements[i];
                if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
                    return Element.extend(element);
                }
            }
        },

        findChildElements: function(element, expressions) {
            var selector = expressions.toArray().join(', ');
            return Prototype.Selector.select(selector, element || document);
        }
    });
})();
