/*  Prototype JavaScript framework, version 1.6.0.2
 *  (c) 2005-2008 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: '1.6.0.2',

  	Browser: {
    	IE:     !!(window.attachEvent && !window.opera),
    	Opera:  !!window.opera,
    	WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    	Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
    	MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  	},

  	BrowserFeatures: {
    	XPath: !!document.evaluate,
    	ElementExtensions: !!window.HTMLElement,
    	SpecificElementExtensions:
      	document.createElement('div').__proto__ &&
      	document.createElement('div').__proto__ !==
        document.createElement('form').__proto__
  	},

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

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

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

/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  	create: function() {
    	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) {
      		var subclass = function() { };
      		subclass.prototype = parent.prototype;
      		klass.prototype = new subclass;
      		parent.subclasses.push(klass);
    	}

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

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

    	klass.prototype.constructor = klass;

    	return klass;
  	}
};

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

    	if (!Object.keys({ toString: true }).length)
      	properties.push("toString", "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().first() == "$super") {
        		var method = value, value = Object.extend((function(m) {
          			return function() { return ancestor[m].apply(this, arguments) };
        		})(property).wrap(method), {
          			valueOf:  function() { return method },
         		 	toString: function() { return method.toString() }
        		});
      		}
      		this.prototype[property] = value;
    	}
    	return this;
  	}
};

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

Object.extend(Object, {
  	inspect: function(object) {
    	try {
      		if (Object.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;
    	}
  	},
  	toJSON: function(object) {
    	var type = typeof object;
    	switch (type) {
      		case 'undefined':
      		case 'function':
      		case 'unknown': return;
      		case 'boolean': return object.toString();
    	}
    	if (object === null) return 'null';
    	if (object.toJSON) return object.toJSON();
    	if (Object.isElement(object)) return;

    	var results = [];
    	for (var property in object) {
      		var value = Object.toJSON(object[property]);
      		if (!Object.isUndefined(value))
        	results.push(property.toJSON() + ': ' + value);
    	}

    	return '{' + results.join(', ') + '}';
  	},

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

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

  	keys: function(object) {
    	var keys = [];
    	for (var property in object)
      	keys.push(property);
    	return keys;
  	},

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

  	clone: function(object) {
    	return Object.extend({ }, object);
  	},

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

  	isArray: function(object) {
    	return object != null && typeof object == "object" &&
      	'splice' in object && 'join' in object;
  	},

  	isHash: function(object) {
    	return object instanceof Hash;
  	},

  	isFunction: function(object) {
    	return typeof object == "function";
  	},

  	isString: function(object) {
    	return typeof object == "string";
  	},

  	isNumber: function(object) {
    	return typeof object == "number";
  	},

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

Object.extend(Function.prototype, {
  	argumentNames: function() {
    	var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
    	return names.length == 1 && !names[0] ? [] : names;
  	},

  	bind: function() {
    	if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    	var __method = this, args = $A(arguments), object = args.shift();
    	return function() {
      		return __method.apply(object, args.concat($A(arguments)));
    	}
  	},

  	bindAsEventListener: function() {
    	var __method = this, args = $A(arguments), object = args.shift();
    	return function(event) {
      		return __method.apply(object, [event || window.event].concat(args));
    	}
  	},

  	curry: function() {
    	if (!arguments.length) return this;
    	var __method = this, args = $A(arguments);
    	return function() {
      		return __method.apply(this, args.concat($A(arguments)));
    	}
  	},

  	delay: function() {
    	var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    	return window.setTimeout(function() {
      		return __method.apply(__method, args);
    	}, timeout);
  	},

  	wrap: function(wrapper) {
    	var __method = this;
    	return function() {
      		return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    	}
  	},

  	methodize: function() {
    	if (this._methodized) return this._methodized;
    	var __method = this;
    	return this._methodized = function() {
      		return __method.apply(null, [this].concat($A(arguments)));
    	};
  	}
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
  	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"';
};

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;
  	}
};

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();
      		} finally {
        		this.currentlyExecuting = false;
      		}
    	}
  	}
});

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, {
  	gsub: function(pattern, replacement) {
    	var result = '', source = this, match;
    	replacement = arguments.callee.prepareReplacement(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;
  	},

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

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

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

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

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

  	stripTags: function() {
    	return this.replace(/<\/?[^>]+>/gi, '');
  	},

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

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

  	evalScripts: function() {
    	return this.extractScripts().map(function(script) { return eval(script) });
  	},

  	escapeHTML: function() {
    	var self = arguments.callee;
    	self.text.data = this;
    	return self.div.innerHTML;
  	},

  	unescapeHTML: function() {
    	var div = new Element('div');
    	div.innerHTML = this.stripTags();
    	return div.childNodes[0] ? (div.childNodes.length > 1 ?
      	$A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      	div.childNodes[0].nodeValue) : '';
  	},

  	toQueryParams: function(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());
        		var 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;
    	});
  	},

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

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

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

  	camelize: function() {
    	var parts = this.split('-'), len = parts.length;
    	if (len == 1) return parts[0];

    	var camelized = this.charAt(0) == '-'
      	? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      	: parts[0];

    	for (var i = 1; i < len; i++)
      	camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    	return camelized;
  	},

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

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

  	dasherize: function() {
    	return this.gsub(/_/,'-');
  	},

  	inspect: function(useDoubleQuotes) {
    	var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      		var character = String.specialChar[match[0]];
      		return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    	});
    	if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    	return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  	},

  	toJSON: function() {
    	return this.inspect(true);
  	},

  	unfilterJSON: function(filter) {
    	return this.sub(filter || Prototype.JSONFilter, '#{1}');
  	},

  	isJSON: function() {
    	var str = this;
    	if (str.blank()) return false;
    	str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    	return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  	},

  	evalJSON: function(sanitize) {
    	var json = this.unfilterJSON();
    	try {
      		if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    	} catch (e) { }
    	throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  	},

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

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

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

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

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

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

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  	escapeHTML: function() {
    	return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  	},
  	unescapeHTML: function() {
    	return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  	}
});

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

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  	div:  document.createElement('div'),
  	text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

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

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

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

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

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

      		while (match != null) {
        		var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : 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 = {
  	each: function(iterator, context) {
    	var index = 0;
    	iterator = iterator.bind(context);
    	try {
      		this._each(function(value) {
        		iterator(value, index++);
      		});
    	} catch (e) {
      		if (e != $break) throw e;
    	}
    	return this;
  	},

  	eachSlice: function(number, iterator, context) {
    	iterator = iterator ? iterator.bind(context) : Prototype.K;
    	var index = -number, slices = [], array = this.toArray();
    	while ((index += number) < array.length)
      	slices.push(array.slice(index, index+number));
    	return slices.collect(iterator, context);
  	},

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

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

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

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

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

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

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

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

  	include: function(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;
  	},

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

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

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

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

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

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

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

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

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

  	toArray: function() {
    	return this.map();
  	},

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

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

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

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

Object.extend(Enumerable, {
  	map:     Enumerable.collect,
  	find:    Enumerable.detect,
  	select:  Enumerable.findAll,
  	filter:  Enumerable.findAll,
  	member:  Enumerable.include,
  	entries: Enumerable.toArray,
  	every:   Enumerable.all,
  	some:    Enumerable.any
});
function $A(iterable) {
  	if (!iterable) return [];
  	if (iterable.toArray) return iterable.toArray();
  	var length = iterable.length || 0, results = new Array(length);
  	while (length--) results[length] = iterable[length];
  	return results;
}

if (Prototype.Browser.WebKit) {
  	$A = function(iterable) {
    	if (!iterable) return [];
    	if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
        iterable.toArray) return iterable.toArray();
    	var length = iterable.length || 0, results = new Array(length);
    	while (length--) results[length] = iterable[length];
    	return results;
  	};
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  	_each: function(iterator) {
    	for (var i = 0, length = this.length; i < length; i++)
      	iterator(this[i]);
  	},

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

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

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

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

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

  	without: function() {
    	var values = $A(arguments);
    	return this.select(function(value) {
      		return !values.include(value);
    	});
  	},

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

  	reduce: function() {
    	return this.length > 1 ? this : this[0];
  	},

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

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

  	clone: function() {
    	return [].concat(this);
  	},

  	size: function() {
    	return this.length;
  	},

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

  	toJSON: function() {
    	var results = [];
    	this.each(function(object) {
      		var value = Object.toJSON(object);
      		if (!Object.isUndefined(value)) results.push(value);
    	});
    	return '[' + results.join(', ') + ']';
  	}
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(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;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(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;
};

Array.prototype.toArray = Array.prototype.clone;

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

if (Prototype.Browser.Opera){
  	Array.prototype.concat = function() {
    	var array = [];
    	for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    	for (var i = 0, length = arguments.length; i < length; i++) {
      		if (Object.isArray(arguments[i])) {
        		for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          		array.push(arguments[i][j]);
      		} else {
        		array.push(arguments[i]);
      		}
    	}
    	return array;
  	};
}
Object.extend(Number.prototype, {
  	toColorPart: function() {
    	return this.toPaddedString(2, 16);
  	},

  	succ: function() {
    	return this + 1;
  	},

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

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

  	toJSON: function() {
    	return isFinite(this) ? this.toString() : 'null';
  	}
});

$w('abs round ceil floor').each(function(method){
  	Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  	return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

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

  	return {
    	initialize: function(object) {
      		this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    	},

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

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

    	get: function(key) {
      		return this._object[key];
    	},

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

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

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

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

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

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

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

    	toQueryString: function() {
      		return this.map(function(pair) {
        		var key = encodeURIComponent(pair.key), values = pair.value;

        		if (values && typeof values == 'object') {
          			if (Object.isArray(values))
            		return values.map(toQueryPair.curry(key)).join('&');
        		}
        		return toQueryPair(key, values);
      		}).join('&');
    	},

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

    	toJSON: function() {
      		return Object.toJSON(this.toObject());
    	},

    	clone: function() {
      		return new Hash(this);
    	}
	}
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  	initialize: function(start, end, exclusive) {
    	this.start = start;
    	this.end = end;
    	this.exclusive = exclusive;
  	},

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

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

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

var Ajax = {
  	getTransport: function() {
    	return Try.these(
      		function() {return new XMLHttpRequest()},
      		function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      		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.isString(this.options.parameters))
      	this.options.parameters = this.options.parameters.toQueryParams();
    	else 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.clone(this.options.parameters);

    	if (!['get', 'post'].include(this.method)) {
      		// simulate other verbs over post
      		params['_method'] = this.method;
      		this.method = 'post';
    	}

    	this.parameters = params;

    	if (params = Object.toQueryString(params)) {
      		// when GET, append parameters to URL
      		if (this.method == 'get')
        	this.url += (this.url.include('?') ? '&' : '?') + params;
      		else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        	params += '&_=';
    	}

    	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';
    	}

    	// user-defined headers
    	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);
  	},

  	getStatus: function() {
    	try {
      		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') {
      		// avoid memory leak in MSIE: clean up
      		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 (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  	// DOM level 2 ECMAScript Language Binding
  	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() {
  	var element = this.Element;
  	this.Element = function(tagName, attributes) {
    	attributes = attributes || { };
    	tagName = tagName.toLowerCase();
    	var cache = Element.cache;
    	if (Prototype.Browser.IE && 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));
    	return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  	};
  	Object.extend(this.Element, element || { });
}).call(window);

Element.cache = { };

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).style.display = 'none';
    	return element;
  	},

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

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

  	update: function(element, content) {
    	element = $(element);
    	if (content && content.toElement) content = content.toElement();
    	if (Object.isElement(content)) return element.update().insert(content);
    	content = Object.toHTML(content);
    	element.innerHTML = content.stripScripts();
    	content.evalScripts.bind(content).defer();
    	return element;
  	},

 	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();
      	var value = (element[property] || '').toString();
      	if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
},

recursivelyCollect: function(element, property) {
	element = $(element);
    var elements = [];
    while (element = element[property])
    if (element.nodeType == 1)
    elements.push(Element.extend(element));
    return elements;
},

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

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

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

immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
},

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

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

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

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

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

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

previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
    Selector.findElement(previousSiblings, expression, index);
},

next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
    Selector.findElement(nextSiblings, expression, index);
},

select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
},

adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
},

identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('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().height;
},

getWidth: function(element) {
    return $(element).getDimensions().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(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(className) ?
    'removeClassName' : 'addClassName'](className);
},

// removes whitespace-only text node children
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);
    var originalAncestor = ancestor;
    if (element.compareDocumentPosition)
    return (element.compareDocumentPosition(ancestor) & 8) === 8;
    if (element.sourceIndex && !Prototype.Browser.Opera) {
      	var e = element.sourceIndex, a = ancestor.sourceIndex,
       	nextAncestor = ancestor.nextSibling;
      	if (!nextAncestor) {
        	do { ancestor = ancestor.parentNode; }
       		while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
      	}
      	if (nextAncestor && nextAncestor.sourceIndex)
       	return (e > a && e < nextAncestor.sourceIndex);
    }
    while (element = element.parentNode)
    if (element == originalAncestor) return true;
    return false;
},

scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    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) {
    	var css = document.defaultView.getComputedStyle(element, null);
    	value = css ? css[style] : null;
	}
    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;
},

getDimensions: function(element) {
    element = $(element);
    var display = $(element).getStyle('display');
    if (display != 'none' && display != null) // Safari bug
    return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
},

makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      	element._madePositioned = true;
      	element.style.position = 'relative';
      	// Opera returns the offset relative to the positioning context, when an
      	// element is position relative but top and left have not been defined
      	if (window.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;
},

cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      	valueT += element.offsetTop  || 0;
      	valueL += element.offsetLeft || 0;
      	element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
},

positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      	valueT += element.offsetTop  || 0;
      	valueL += element.offsetLeft || 0;
      	element = element.offsetParent;
      	if (element) {
        	if (element.tagName == 'BODY') break;
        	var p = Element.getStyle(element, 'position');
        	if (p !== 'static') break;
      	}
    } while (element);
    return Element._returnOffset(valueL, valueT);
},

absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.
    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;
    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;
    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
},

relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.
    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
},

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

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

viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;
    var element = forElement;
    do {
      	valueT += element.offsetTop  || 0;
      	valueL += element.offsetLeft || 0;
      	// Safari fix
      	if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;
    } while (element = element.offsetParent);
    element = forElement;
    do {
      	if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
        	valueT -= element.scrollTop  || 0;
        	valueL -= element.scrollLeft || 0;
      	}
    } while (element = element.parentNode);
    return Element._returnOffset(valueL, valueT);
},

clonePosition: function(element, source) {
    var options = Object.extend({
      	setLeft:    true,
      	setTop:     true,
      	setWidth:   true,
      	setHeight:  true,
      	offsetTop:  0,
      	offsetLeft: 0
    }, arguments[2] || { });
    // find page position of source
    source = $(source);
    var p = source.viewportOffset();
    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
    	parent = element.getOffsetParent();
      	delta = parent.viewportOffset();
    }
    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      	delta[0] -= document.body.offsetLeft;
      	delta[1] -= document.body.offsetTop;
    }
    // set position
    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;
}
};

Element.Methods.identify.counter = 1;

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 'left': case 'top': case 'right': case 'bottom':
        		if (proceed(element, 'position') === 'static') return null;
        		case 'height': case 'width':
        		// returns '0px' for hidden elements; we want it to return null
        		if (!Element.visible(element)) return null;
        		// returns the border-box dimensions rather than the content-box
        		// dimensions, so we subtract padding and borders from the value
        		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) {
  	// IE doesn't report offsets correctly for static elements, so we change them
  	// to "relative" to get the values, then change them back.
  	Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    	function(proceed, element) {
      		element = $(element);
      		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;
    	}
 	);

  	$w('positionedOffset viewportOffset').each(function(method) {
    	Element.Methods[method] = Element.Methods[method].wrap(
      		function(proceed, element) {
        		element = $(element);
        		var position = element.getStyle('position');
        		if (position !== 'static') return proceed(element);
        		// Trigger hasLayout on the offset parent so that IE6 reports
        		// accurate offsetTop and offsetLeft values for position: fixed.
        		var offsetParent = element.getOffsetParent();
        		if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          		offsetParent.setStyle({ zoom: 1 });
        		element.setStyle({ position: 'relative' });
        		var value = proceed(element);
        		element.setStyle({ position: position });
        		return value;
      		}
    	);
	});

  	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 = {
    	read: {
      		names: {
        		'class': 'className',
        		'for':   'htmlFor'
      		},
      		values: {
        		_getAttr: function(element, attribute) {
          			return element.getAttribute(attribute, 2);
        		},
        		_getAttrNode: function(element, attribute) {
          			var node = element.getAttributeNode(attribute);
          			return node ? node.value : "";
        		},
        		_getEv: function(element, attribute) {
          			attribute = element.getAttribute(attribute);
          			return attribute ? attribute.toString().slice(23, -2) : null;
        		},
        		_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').each(function(attr) {
		Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
   		Element._attributeTranslations.has[attr.toLowerCase()] = attr;
	});

	(function(v) {
		Object.extend(v, {
    		href:        v._getAttr,
    		src:         v._getAttr,
    		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);
}

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 == 'IMG' && element.width) {
        	element.width++; element.width--;
      	} else try {
        	var n = document.createTextNode(' ');
        	element.appendChild(n);
        	element.removeChild(n);
      	} catch (e) { }
    	return element;
	};
  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  	Element.Methods.cumulativeOffset = function(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 Element._returnOffset(valueL, valueT);
  	};
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  	// IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  	Element.Methods.update = function(element, content) {
    	element = $(element);

    	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 in Element._insertionTranslations.tags) {
    	  	$A(element.childNodes).each(function(node) { element.removeChild(node) });
    	  	Element._getContentFromAnonymousElement(tagName, content.stripScripts())
    	    .each(function(node) { element.appendChild(node) });
    	}
    	else element.innerHTML = content.stripScripts();

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

if ('outerHTML' in document.createElement('div')) {
  	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();
      		var 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) {
  	var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  	if (t) {
    	div.innerHTML = t[0] + html + t[1];
    	t[2].times(function() { 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() {
  	Object.extend(this.tags, {
    	THEAD: this.tags.TBODY,
    	TFOOT: this.tags.TBODY,
    	TH:    this.tags.TD
  	});
}).call(Element._insertionTranslations);

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);

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

Element.extend = (function() {
  	if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;
  	var Methods = { }, ByTag = Element.Methods.ByTag;
  	var extend = Object.extend(function(element) {
    	if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;
		var methods = Object.clone(Methods),
      	tagName = element.tagName, property, value;
		// extend methods for specific tags
    	if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
    	for (property in methods) {
      		value = methods[property];
      		if (Object.isFunction(value) && !(property in element))
        	element[property] = value.methodize();
    	}

    	element._extendedByPrototype = Prototype.emptyFunction;
    	return element;
  	}, {
    	refresh: function() {
      		// extend methods for all tags (Safari doesn't need this)
      		if (!Prototype.BrowserFeatures.ElementExtensions) {
        		Object.extend(Methods, Element.Methods);
        		Object.extend(Methods, Element.Methods.Simulated);
      		}
    	}
  	});

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

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

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)
    	});
  	}

  	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];

    	window[klass] = { };
    	window[klass].prototype = document.createElement(tagName).__proto__;
    	return window[klass];
  	}

  	if (F.ElementExtensions) {
    	copy(Element.Methods, HTMLElement.prototype);
    	copy(Element.Methods.Simulated, HTMLElement.prototype, 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() {
    	var dimensions = { };
    	var B = Prototype.Browser;
    	$w('width height').each(function(d) {
      		var D = d.capitalize();
      		dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
        	(B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
    	});
    	return dimensions;
  	},

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

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

  	getScrollOffsets: function() {
    	return Element._returnOffset(
      	window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      	window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  	}
};
/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  	initialize: function(expression) {
    	this.expression = expression.strip();
    	this.compileMatcher();
  	},

  	shouldUseXPath: function() {
    	if (!Prototype.BrowserFeatures.XPath) return false;
    	var e = this.expression;

    	// Safari 3 chokes on :*-of-type and :empty
    	if (Prototype.Browser.WebKit &&
     	(e.include("-of-type") || e.include(":empty")))
      	return false;

    	// XPath can't do namespaced attributes, nor can it read
    	// the "checked" property from DOM nodes
    	if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
      	return false;

    	return true;
  	},

  	compileMatcher: function() {
    	if (this.shouldUseXPath())
      	return this.compileXPathMatcher();

    	var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
    	c = Selector.criteria, le, p, m;

    	if (Selector._cache[e]) {
      		this.matcher = Selector._cache[e];
      		return;
    	}

    	this.matcher = ["this.matcher = function(root) {",
        
		"var r = root, h = Selector.handlers, c = false, n;"];

    	while (e && le != e && (/\S/).test(e)) {
      		le = e;
      		for (var i in ps) {
        		p = ps[i];
        		if (m = e.match(p)) {
          			this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
    	      		new Template(c[i]).evaluate(m));
          			e = e.replace(m[0], '');
          			break;
        		}
      		}
    	}

    	this.matcher.push("return h.unique(n);\n}");
    	eval(this.matcher.join('\n'));
    	Selector._cache[this.expression] = this.matcher;
  	},

  	compileXPathMatcher: function() {
    	var e = this.expression, ps = Selector.patterns,
        	x = Selector.xpath, le, m;

    	if (Selector._cache[e]) {
      		this.xpath = Selector._cache[e]; return;
    	}

    	this.matcher = ['.//*'];
    	while (e && le != e && (/\S/).test(e)) {
      		le = e;
      		for (var i in ps) {
        		if (m = e.match(ps[i])) {
          			this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            		new Template(x[i]).evaluate(m));
          			e = e.replace(m[0], '');
          			break;
        		}
      		}
		}

    	this.xpath = this.matcher.join('');
    	Selector._cache[this.expression] = this.xpath;
  	},

  	findElements: function(root) {
    	root = root || document;
    	if (this.xpath) return document._getElementsByXPath(this.xpath, root);
    	return this.matcher(root);
  	},

  	match: function(element) {
    	this.tokens = [];

    	var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    	var le, p, m;

    	while (e && le !== e && (/\S/).test(e)) {
      		le = e;
      		for (var i in ps) {
        		p = ps[i];
        		if (m = e.match(p)) {
          			// use the Selector.assertions methods unless the selector
          			// is too complex.
          			if (as[i]) {
            			this.tokens.push([i, Object.clone(m)]);
            			e = e.replace(m[0], '');
          			} else {
            			// reluctantly do a document-wide search
            			// and look for a match in the array
            			return this.findElements(document).include(element);
          			}
        		}
      		}
    	}

    	var match = true, name, matches;
    	for (var i = 0, token; token = this.tokens[i]; i++) {
      		name = token[0], matches = token[1];
      		if (!Selector.assertions[name](element, matches)) {
        		match = false; break;
      		}
    	}
    	return match;
  	},

  	toString: function() {
    	return this.expression;
  	},

  	inspect: function() {
    	return "#<Selector:" + this.expression.inspect() + ">";
  	}
});

Object.extend(Selector, {
  	_cache: { },
  	xpath: {
    	descendant:   "//*",
    	child:        "/*",
    	adjacent:     "/following-sibling::*[1]",
    	laterSibling: '/following-sibling::*',
    	tagName:      function(m) {
      		if (m[1] == '*') return '';
      		return "[local-name()='" + m[1].toLowerCase() +
            "' or local-name()='" + m[1].toUpperCase() + "']";
    	},
    	className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    	id:           "[@id='#{1}']",
    	attrPresence: function(m) {
      		m[1] = m[1].toLowerCase();
      		return new Template("[@#{1}]").evaluate(m);
    	},
    	attr: function(m) {
      		m[1] = m[1].toLowerCase();
      		m[3] = m[5] || m[6];
      		return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    	},
    	pseudo: function(m) {
      		var h = Selector.xpath.pseudos[m[1]];
      		if (!h) return '';
      		if (Object.isFunction(h)) return h(m);
      		return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    	},
    	operators: {
      		'=':  "[@#{1}='#{3}']",
      		'!=': "[@#{1}!='#{3}']",
      		'^=': "[starts-with(@#{1}, '#{3}')]",
      		'$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      		'*=': "[contains(@#{1}, '#{3}')]",
      		'~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      		'|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    	},
    	pseudos: {
      		'first-child': '[not(preceding-sibling::*)]',
      		'last-child':  '[not(following-sibling::*)]',
      		'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      		'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
      		'checked':     "[@checked]",
      		'disabled':    "[@disabled]",
      		'enabled':     "[not(@disabled)]",
      		'not': function(m) {
        		var e = m[6], p = Selector.patterns,
            	x = Selector.xpath, le, v;
        		var exclusion = [];
        		while (e && le != e && (/\S/).test(e)) {
          			le = e;
          			for (var i in p) {
            			if (m = e.match(p[i])) {
              				v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              				exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              				e = e.replace(m[0], '');
              				break;
            			}
          			}
        		}
        		return "[not(" + exclusion.join(" and ") + ")]";
      		},
      		'nth-child':      function(m) {
        		return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      		},
      		'nth-last-child': function(m) {
        		return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      		},
      		'nth-of-type':    function(m) {
        		return Selector.xpath.pseudos.nth("position() ", m);
      		},
      		'nth-last-of-type': function(m) {
        		return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      		},
      		'first-of-type':  function(m) {
        		m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      		},
      		'last-of-type':   function(m) {
        		m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      		},
      		'only-of-type':   function(m) {
        		var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      		},
      		nth: function(fragment, m) {
        		var mm, formula = m[6], predicate;
        		if (formula == 'even') formula = '2n+0';
        		if (formula == 'odd')  formula = '2n+1';
        		if (mm = formula.match(/^(\d+)$/)) // digit only
          		return '[' + fragment + "= " + mm[1] + ']';
        		if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          			if (mm[1] == "-") mm[1] = -1;
          			var a = mm[1] ? Number(mm[1]) : 1;
          			var b = mm[2] ? Number(mm[2]) : 0;
          			predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          			"((#{fragment} - #{b}) div #{a} >= 0)]";
          			return new Template(predicate).evaluate({
            		fragment: fragment, a: a, b: b });
        		}
      		}
    	}
  	},

  	criteria: {
    	tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    	className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    	id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    	attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    	attr: function(m) {
      		m[3] = (m[5] || m[6]);
      		return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    	},
    	pseudo: function(m) {
      		if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      		return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    	},
    	descendant:   'c = "descendant";',
    	child:        'c = "child";',
    	adjacent:     'c = "adjacent";',
    	laterSibling: 'c = "laterSibling";'
  	},

  	patterns: {
    	// combinators must be listed first
    	// (and descendant needs to be last combinator)
    	laterSibling: /^\s*~\s*/,
    	child:        /^\s*>\s*/,
    	adjacent:     /^\s*\+\s*/,
    	descendant:   /^\s/,

    	// selectors follow
    	tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    	id:           /^#([\w\-\*]+)(\b|$)/,
    	className:    /^\.([\w\-\*]+)(\b|$)/,
    	pseudo:		  /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    	attrPresence: /^\[([\w]+)\]/,
    	attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  	},

  	// for Selector.match and Element#match
  	assertions: {
    	tagName: function(element, matches) {
      		return matches[1].toUpperCase() == element.tagName.toUpperCase();
    	},

    	className: function(element, matches) {
      		return Element.hasClassName(element, matches[1]);
    	},

    	id: function(element, matches) {
      		return element.id === matches[1];
    	},

    	attrPresence: function(element, matches) {
      		return Element.hasAttribute(element, matches[1]);
    	},

    	attr: function(element, matches) {
      		var nodeValue = Element.readAttribute(element, matches[1]);
      		return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    	}
  	},

  	handlers: {
    	// UTILITY FUNCTIONS
    	// joins two collections
    	concat: function(a, b) {
      		for (var i = 0, node; node = b[i]; i++)
        	a.push(node);
      		return a;
    	},

    	// marks an array of nodes for counting
    	mark: function(nodes) {
      		var _true = Prototype.emptyFunction;
      		for (var i = 0, node; node = nodes[i]; i++)
        	node._countedByPrototype = _true;
      		return nodes;
    	},

    	unmark: function(nodes) {
      		for (var i = 0, node; node = nodes[i]; i++)
        	node._countedByPrototype = undefined;
      		return nodes;
    	},

    	// mark each child node with its position (for nth calls)
    	// "ofType" flag indicates whether we're indexing for nth-of-type
    	// rather than nth-child
    	index: function(parentNode, reverse, ofType) {
      		parentNode._countedByPrototype = Prototype.emptyFunction;
      		if (reverse) {
        		for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          			var node = nodes[i];
          			if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        		}
      		} else {
        		for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          		if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      		}
    	},

    	// filters out duplicates and extends all nodes
    	unique: function(nodes) {
      		if (nodes.length == 0) return nodes;
      		var results = [], n;
      		for (var i = 0, l = nodes.length; i < l; i++)
        	if (!(n = nodes[i])._countedByPrototype) {
          		n._countedByPrototype = Prototype.emptyFunction;
          		results.push(Element.extend(n));
        	}
      		return Selector.handlers.unmark(results);
    	},

    	// COMBINATOR FUNCTIONS
    	descendant: function(nodes) {
      		var h = Selector.handlers;
      		for (var i = 0, results = [], node; node = nodes[i]; i++)
        	h.concat(results, node.getElementsByTagName('*'));
      		return results;
    	},

    	child: function(nodes) {
      		var h = Selector.handlers;
      		for (var i = 0, results = [], node; node = nodes[i]; i++) {
        		for (var j = 0, child; child = node.childNodes[j]; j++)
          		if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      		}
      		return results;
    	},

    	adjacent: function(nodes) {
      		for (var i = 0, results = [], node; node = nodes[i]; i++) {
        		var next = this.nextElementSibling(node);
        		if (next) results.push(next);
      		}
      		return results;
    	},

    	laterSibling: function(nodes) {
      		var h = Selector.handlers;
      		for (var i = 0, results = [], node; node = nodes[i]; i++)
        	h.concat(results, Element.nextSiblings(node));
      		return results;
    	},

    	nextElementSibling: function(node) {
      		while (node = node.nextSibling)
	      	if (node.nodeType == 1) return node;
      		return null;
    	},

    	previousElementSibling: function(node) {
      		while (node = node.previousSibling)
        	if (node.nodeType == 1) return node;
      		return null;
    	},

    	// TOKEN FUNCTIONS
    	tagName: function(nodes, root, tagName, combinator) {
      		var uTagName = tagName.toUpperCase();
      		var results = [], h = Selector.handlers;
      		if (nodes) {
        		if (combinator) {
          			// fastlane for ordinary descendant combinators
          			if (combinator == "descendant") {
            			for (var i = 0, node; node = nodes[i]; i++)
              			h.concat(results, node.getElementsByTagName(tagName));
            			return results;
          			} else nodes = this[combinator](nodes);
          			if (tagName == "*") return nodes;
        		}
        	for (var i = 0, node; node = nodes[i]; i++)
          	if (node.tagName.toUpperCase() === uTagName) results.push(node);
        	return results;
      	} else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      	var targetNode = $(id), h = Selector.handlers;
      	if (!targetNode) return [];
      	if (!nodes && root == document) return [targetNode];
      	if (nodes) {
        	if (combinator) {
          		if (combinator == 'child') {
            		for (var i = 0, node; node = nodes[i]; i++)
              		if (targetNode.parentNode == node) return [targetNode];
          		} else if (combinator == 'descendant') {
            		for (var i = 0, node; node = nodes[i]; i++)
              		if (Element.descendantOf(targetNode, node)) return [targetNode];
          		} else if (combinator == 'adjacent') {
            		for (var i = 0, node; node = nodes[i]; i++)
              		if (Selector.handlers.previousElementSibling(targetNode) == node)
                	return [targetNode];
          		} else nodes = h[combinator](nodes);
        	}
        	for (var i = 0, node; node = nodes[i]; i++)
          	if (node == targetNode) return [targetNode];
        	return [];
      	}
      	return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      	if (nodes && combinator) nodes = this[combinator](nodes);
      	return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      	if (!nodes) nodes = Selector.handlers.descendant([root]);
      	var needle = ' ' + className + ' ';
      	for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        	nodeClassName = node.className;
        	if (nodeClassName.length == 0) continue;
        	if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          	results.push(node);
      	}
      	return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      	if (!nodes) nodes = root.getElementsByTagName("*");
      	if (nodes && combinator) nodes = this[combinator](nodes);
      	var results = [];
      	for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      	return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      	if (!nodes) nodes = root.getElementsByTagName("*");
      	if (nodes && combinator) nodes = this[combinator](nodes);
      	var handler = Selector.operators[operator], results = [];
      	for (var i = 0, node; node = nodes[i]; i++) {
        	var nodeValue = Element.readAttribute(node, attr);
        	if (nodeValue === null) continue;
        	if (handler(nodeValue, value)) results.push(node);
      	}
      	return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      	if (nodes && combinator) nodes = this[combinator](nodes);
      	if (!nodes) nodes = root.getElementsByTagName("*");
      	return Selector.pseudos[name](nodes, value, root);
    }
},

pseudos: {
	'first-child': function(nodes, value, root) {
    	for (var i = 0, results = [], node; node = nodes[i]; i++) {
        	if (Selector.handlers.previousElementSibling(node)) continue;
          	results.push(node);
      	}
      	return results;
    },
    'last-child': function(nodes, value, root) {
      	for (var i = 0, results = [], node; node = nodes[i]; i++) {
        	if (Selector.handlers.nextElementSibling(node)) continue;
          	results.push(node);
      	}
      	return results;
    },
    'only-child': function(nodes, value, root) {
     	var h = Selector.handlers;
      	for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
        results.push(node);
      	return results;
    },
    'nth-child':        function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      	return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      	var p = Selector.pseudos;
      	return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      	if (a == 0) return b > 0 ? [b] : [];
      	return $R(1, total).inject([], function(memo, i) {
        	if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        	return memo;
      	});
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      	if (nodes.length == 0) return [];
     	if (formula == 'even') formula = '2n+0';
      	if (formula == 'odd')  formula = '2n+1';
     	var h = Selector.handlers, results = [], indexed = [], m;
      	h.mark(nodes);
		for (var i = 0, node; node = nodes[i]; i++) {
        	if (!node.parentNode._countedByPrototype) {
          		h.index(node.parentNode, reverse, ofType);
          		indexed.push(node.parentNode);
        	}
      	}
      	if (formula.match(/^\d+$/)) { // just a number
        	formula = Number(formula);
        	for (var i = 0, node; node = nodes[i]; i++)
          	if (node.nodeIndex == formula) results.push(node);
      	} else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        	if (m[1] == "-") m[1] = -1;
        	var a = m[1] ? Number(m[1]) : 1;
        	var b = m[2] ? Number(m[2]) : 0;
        	var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        	for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          		for (var j = 0; j < l; j++)
            	if (node.nodeIndex == indices[j]) results.push(node);
        	}
      	}
      	h.unmark(nodes);
      	h.unmark(indexed);
      	return results;
    },

    'empty': function(nodes, value, root) {
      	for (var i = 0, results = [], node; node = nodes[i]; i++) {
        	// IE treats comments as element nodes
        	if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
        	results.push(node);
      	}
      	return results;
    },

    'not': function(nodes, selector, root) {
      	var h = Selector.handlers, selectorType, m;
      	var exclusions = new Selector(selector).findElements(root);
      	h.mark(exclusions);
      	for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      	h.unmark(exclusions);
      	return results;
    },

    'enabled': function(nodes, value, root) {
      	for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled) results.push(node);
      	return results;
    },

    'disabled': function(nodes, value, root) {
      	for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      	return results;
    },

    'checked': function(nodes, value, root) {
      	for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      	return results;
    }
},

operators: {
	'=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv.startsWith(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
},

split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      	expressions.push(m[1].strip());
    });
    return expressions;
},

matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
   	if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
},

findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      	index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
},

findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      	selector = new Selector(expressions[i].strip());
      	h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
}
});

if (Prototype.Browser.IE) {
  	Object.extend(Selector.handlers, {
    	// IE returns comment nodes on getElementsByTagName("*").
    	// Filter them out.
    	concat: function(a, b) {
      		for (var i = 0, node; node = b[i]; i++)
        	if (node.tagName !== "!") a.push(node);
      		return a;
    	},

    	// IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    	unmark: function(nodes) {
      	for (var i = 0, node; node = nodes[i]; i++)
        	node.removeAttribute('_countedByPrototype');
      		return nodes;
    	}
  	});
}

function $$() {
  	return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  	reset: function(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;

    	var data = elements.inject({ }, function(result, element) {
      		if (!element.disabled && element.name) {
        		key = element.name; value = $(element).getValue();
        		if (value != null && (element.type != 'submit' || (!submitted &&
            	submit !== false && (!submit || key == submit) && (submitted = true)))) {
          			if (key in result) {
            			// a key is already present; construct an array of values
            			if (!Object.isArray(result[key])) result[key] = [result[key]];
            			result[key].push(value);
          			}
          			else result[key] = value;
        		}
      		}
      		return result;
    	});

    	return options.hash ? data : Object.toQueryString(data);
  	}
};

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

  	getElements: function(form) {
    	return $A($(form).getElementsByTagName('*')).inject([],
      	function(elements, child) {
        	if (Form.Element.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).map(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'].include(element.tagName.toLowerCase());
    });
},

focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().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'].include(element.type)))
        	element.select();
    	} catch (e) { }
    	return element;
  	},

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

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

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

  	select: function(element, index) {
    	if (Object.isUndefined(index))
      	return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    	else {
      		var opt, value, single = !Object.isArray(index);
      		for (var i = 0, length = element.length; i < length; i++) {
        		opt = element.options[i];
        		value = this.optionValue(opt);
        		if (single) {
          			if (value == index) {
            			opt.selected = true;
            			return;
          			}
        		}
        		else opt.selected = index.include(value);
      		}
    	}
	},

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

  	selectMany: function(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(this.optionValue(opt));
    	}
    	return values;
  	},

  	optionValue: function(opt) {
    	// extend element because hasAttribute may not be native
    	return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  	}
};

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

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);
  	}
});
if (!window.Event) var Event = { };

Object.extend(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: { },

  	relatedTarget: function(event) {
    	var element;
    	switch(event.type) {
      		case 'mouseover': element = event.fromElement; break;
      		case 'mouseout':  element = event.toElement;   break;
      		default: return null;
    	}
    	return Element.extend(element);
  	}
});

Event.Methods = (function() {
  	var isButton;

  	if (Prototype.Browser.IE) {
    	var buttonMap = { 0: 1, 1: 4, 2: 2 };
    	isButton = function(event, code) {
     		return event.button == buttonMap[code];
    	};

  	} else if (Prototype.Browser.WebKit) {
    	isButton = function(event, code) {
      		switch (code) {
        		case 0: return event.which == 1 && !event.metaKey;
        		case 1: return event.which == 1 && event.metaKey;
        		default: return false;
      		}
    	};
  	} else {
    	isButton = function(event, code) {
      		return event.which ? (event.which === code + 1) : (event.button === code);
    	};
  	}

  	return {
    	isLeftClick:   function(event) { return isButton(event, 0) },
    	isMiddleClick: function(event) { return isButton(event, 1) },
    	isRightClick:  function(event) { return isButton(event, 2) },

    	element: function(event) {
      		var node = Event.extend(event).target;
      		return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
    	},

    	findElement: function(event, expression) {
      		var element = Event.element(event);
      		if (!expression) return element;
      		var elements = [element].concat(element.ancestors());
      		return Selector.findElement(elements, expression, 0);
    	},

    	pointer: function(event) {
      		return {
        		x: event.pageX || (event.clientX +
          			(document.documentElement.scrollLeft || document.body.scrollLeft)),
        		y: event.pageY || (event.clientY +
          			(document.documentElement.scrollTop || document.body.scrollTop))
      			};
    		},

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

    	stop: function(event) {
      		Event.extend(event);
      		event.preventDefault();
      		event.stopPropagation();
      		event.stopped = true;
    	}
  	};
})();

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

  	if (Prototype.Browser.IE) {
    	Object.extend(methods, {
      		stopPropagation: function() { this.cancelBubble = true },
      		preventDefault:  function() { this.returnValue = false },
      		inspect: function() { return "[object Event]" }
    	});

    	return function(event) {
      		if (!event) return false;
      		if (event._extendedByPrototype) return event;

      		event._extendedByPrototype = Prototype.emptyFunction;
      		var pointer = Event.pointer(event);
      		Object.extend(event, {
        		target: event.srcElement,
        		relatedTarget: Event.relatedTarget(event),
        		pageX:  pointer.x,
        		pageY:  pointer.y
      		});
      		return Object.extend(event, methods);
    	};

  	} else {
    	Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
    	Object.extend(Event.prototype, methods);
    	return Prototype.K;
  	}
})();

Object.extend(Event, (function() {
  	var cache = Event.cache;

  	function getEventID(element) {
    	if (element._prototypeEventID) return element._prototypeEventID[0];
    	arguments.callee.id = arguments.callee.id || 1;
    	return element._prototypeEventID = [++arguments.callee.id];
  	}

  	function getDOMEventName(eventName) {
    	if (eventName && eventName.include(':')) return "dataavailable";
    	return eventName;
  	}

  	function getCacheForID(id) {
    	return cache[id] = cache[id] || { };
  	}

  	function getWrappersForEventName(id, eventName) {
    	var c = getCacheForID(id);
    	return c[eventName] = c[eventName] || [];
  	}

  	function createWrapper(element, eventName, handler) {
    	var id = getEventID(element);
    	var c = getWrappersForEventName(id, eventName);
    	if (c.pluck("handler").include(handler)) return false;

    	var wrapper = function(event) {
      		if (!Event || !Event.extend ||
        	(event.eventName && event.eventName != eventName))
          	return false;
      		Event.extend(event);
      		handler.call(element, event);
    	};

    	wrapper.handler = handler;
    	c.push(wrapper);
    	return wrapper;
  	}

  	function findWrapper(id, eventName, handler) {
    	var c = getWrappersForEventName(id, eventName);
    	return c.find(function(wrapper) { return wrapper.handler == handler });
  	}

  	function destroyWrapper(id, eventName, handler) {
    	var c = getCacheForID(id);
    	if (!c[eventName]) return false;
    	c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  	}

  	function destroyCache() {
    	for (var id in cache)
      	for (var eventName in cache[id])
        cache[id][eventName] = null;
  	}

  	if (window.attachEvent) {
    	window.attachEvent("onunload", destroyCache);
  	}

  	return {
    	observe: function(element, eventName, handler) {
      		element = $(element);
      		var name = getDOMEventName(eventName);
      		var wrapper = createWrapper(element, eventName, handler);
      		if (!wrapper) return element;
      		if (element.addEventListener) {
        		element.addEventListener(name, wrapper, false);
      		} else {
        	element.attachEvent("on" + name, wrapper);
      	}
      	return element;
    },
    stopObserving: function(element, eventName, handler) {
      	element = $(element);
      	var id = getEventID(element), name = getDOMEventName(eventName);
      	if (!handler && eventName) {
        	getWrappersForEventName(id, eventName).each(function(wrapper) {
          		element.stopObserving(eventName, wrapper.handler);
        	});
        	return element;

      	} else if (!eventName) {
        	Object.keys(getCacheForID(id)).each(function(eventName) {
          		element.stopObserving(eventName);
        	});
        	return element;
      	}

      	var wrapper = findWrapper(id, eventName, handler);
      	if (!wrapper) return element;
      	if (element.removeEventListener) {
        	element.removeEventListener(name, wrapper, false);
      	} else {
        	element.detachEvent("on" + name, wrapper);
      	}

      	destroyWrapper(id, eventName, handler);

      	return element;
	},

    fire: function(element, eventName, memo) {
      	element = $(element);
      	if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      	var event;
      	if (document.createEvent) {
        	event = document.createEvent("HTMLEvents");
        	event.initEvent("dataavailable", true, true);
      	} else {
        	event = document.createEventObject();
        	event.eventType = "ondataavailable";
      	}
      	event.eventName = eventName;
      	event.memo = memo || { };

      	if (document.createEvent) {
        	element.dispatchEvent(event);
      	} else {
        	element.fireEvent(event.eventType, event);
      	}
      	return Event.extend(event);
    }
};
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  	fire:          Event.fire,
  	observe:       Event.observe,
  	stopObserving: Event.stopObserving
});

Object.extend(document, {
  	fire:          Element.Methods.fire.methodize(),
  	observe:       Element.Methods.observe.methodize(),
  	stopObserving: Element.Methods.stopObserving.methodize(),
  	loaded:        false
});

(function() {
  	/* Support for the DOMContentLoaded event is based on work by Dan Webb,
   	Matthias Miller, Dean Edwards and John Resig. */

  	var timer;

  	function fireContentLoadedEvent() {
    	if (document.loaded) return;
    	if (timer) window.clearInterval(timer);
    	document.fire("dom:loaded");
    	document.loaded = true;
  	}

  	if (document.addEventListener) {
    	if (Prototype.Browser.WebKit) {
      		timer = window.setInterval(function() {
        		if (/loaded|complete/.test(document.readyState))
          		fireContentLoadedEvent();
      		}, 0);

      		Event.observe(window, "load", fireContentLoadedEvent);

    	} else {
      		document.addEventListener("DOMContentLoaded",
        	fireContentLoadedEvent, false);
    	}
  	} else {
    	document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    	$("__onDOMContentLoaded").onreadystatechange = function() {
      		if (this.readyState == "complete") {
        		this.onreadystatechange = null;
        		fireContentLoadedEvent();
      		}
    	};
  	}
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.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');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  	// set to true if needed, warning: firefox performance problems
  	// NOT neeeded for page scrolling, only if draggable contained in
  	// scrollable elements
  	includeScrollOffsets: false,

	// must be called before calling withinIncludingScrolloffset, every time the
  	// page is scrolled
  	prepare: function() {
    	this.deltaX =  window.pageXOffset
       		|| document.documentElement.scrollLeft
        	|| document.body.scrollLeft
            || 0;
    	this.deltaY =  window.pageYOffset
            || document.documentElement.scrollTop
            || document.body.scrollTop
            || 0;
  	},

  	// caches x/y coordinate pair to use with overlap
  	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);
  	},

  	// within must be called directly before
  	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;
  	},

  	// Deprecation layer -- use newer Element methods now (1.5.2).

  	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).map(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);

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

Element.addMethods();