var Prototype = {
	Version: '1.5.0',
  	BrowserFeatures: {
    	XPath: !!document.evaluate
  	},

  	ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
  	emptyFunction: function() {},
  	K: function(x) { return x }
}

var Class = {
	create: function() {
    	return function() {
      		this.initialize.apply(this, arguments);
    	}
  	}
};

var Abstract = new Object();

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 === undefined) return 'undefined';
      		if (object === null) return 'null';
      		return object.inspect ? object.inspect() : object.toString();
    	} catch (e) {
      		if (e instanceof RangeError) return '...';
      		throw e;
    	}
  	},

  	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);
  	}
});

Function.prototype.bind = function() {
  	var __method = this, args = $A(arguments), object = args.shift();
  	return function() {
    	return __method.apply(object, args.concat($A(arguments)));
  	}
}

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

Object.extend(Number.prototype, {
	toColorPart: function() {
    	var digits = this.toString(16);
    	if (this < 16) return '0' + digits;
    	return digits;
  	},

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

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

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;
  	}
}

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

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
  	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);
  	},

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

  	onTimerEvent: function() {
    	if (!this.currentlyExecuting) {
      		try {
        		this.currentlyExecuting = true;
        		this.callback(this);
      		} finally {
        		this.currentlyExecuting = false;
      		}
    	}
  	}
}

String.interpret = function(value){
  	return value == null ? '' : String(value);
}

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 = count === undefined ? 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 this;
  	},

  	truncate: function(length, truncation) {
    	length = length || 30;
    	truncation = truncation === undefined ? '...' : truncation;
    	return this.length > length ? this.slice(0, length - truncation.length) + truncation : 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 div = document.createElement('div');
    	var text = document.createTextNode(this);
    	div.appendChild(text);
    	return div.innerHTML;
  	},

  	unescapeHTML: function() {
    	var div = document.createElement('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 name = decodeURIComponent(pair[0]);
        		var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;

        		if (hash[name] !== undefined) {
          			if (hash[name].constructor != Array)
            			hash[name] = [hash[name]];
          			if (value) hash[name].push(value);
        		}
        		else hash[name] = 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);
  	},

  	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.replace(/\\/g, '\\\\');
    	if (useDoubleQuotes)
      		return '"' + escapedString.replace(/"/g, '\\"') + '"';
    	else
      		return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  	}
});

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

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

var Template = Class.create();
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
Template.prototype = {
  	initialize: function(template, pattern) {
    	this.template = template.toString();
    	this.pattern  = pattern || Template.Pattern;
  	},

  	evaluate: function(object) {
    	return this.template.gsub(this.pattern, function(match) {
      		var before = match[1];
      		if (before == '\\') return match[2];
      		return before + String.interpret(object[match[3]]);
    	});
  	}
};

var $break    = new Object();
var $continue = new Object();

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

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

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

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

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

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

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

  	grep: function(pattern, iterator) {
    	var results = [];
    	this.each(function(value, index) {
      		var stringValue = value.toString();
      		if (stringValue.match(pattern))
        		results.push((iterator || Prototype.K)(value, index));
    	})
    	return results;
  	},

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

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

  	inject: function(memo, iterator) {
    	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) {
    	var result;
    	this.each(function(value, index) {
      		value = (iterator || Prototype.K)(value, index);
      		if (result == undefined || value >= result)
        		result = value;
    	});
    	return result;
  	},

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

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

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

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

  	sortBy: function(iterator) {
    	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 (typeof args.last() == 'function')
      		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,
  	member:  Enumerable.include,
  	entries: Enumerable.toArray
});

var $A = Array.from = function(iterable) {
  	if (!iterable) return [];
  	if (iterable.toArray) {
    	return iterable.toArray();
  	} else {
    	var results = [];
    	for (var i = 0, length = iterable.length; i < length; i++)
      		results.push(iterable[i]);
    	return results;
  	}
}

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(value && value.constructor == Array ? value.flatten() : [value]);
    	});
  	},

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

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

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

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

  	uniq: function() {
    	return this.inject([], function(array, value) {
      		return array.include(value) ? array : array.concat([value]);
    	});
  	},

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

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

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

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

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

if(window.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(arguments[i].constructor == Array) {
        		for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          			array.push(arguments[i][j]);
      		} else {
        		array.push(arguments[i]);
      		}
    	}
    	return array;
  	}
}

var Hash = function(obj) {
  	Object.extend(this, obj || {});
};

Object.extend(Hash, {
  	toQueryString: function(obj) {
    	var parts = [];

	  	this.prototype._each.call(obj, function(pair) {
      		if (!pair.key) return;

      		if (pair.value && pair.value.constructor == Array) {
        		var values = pair.value.compact();
        		if (values.length < 2) pair.value = values.reduce();
        		else {
        			key = encodeURIComponent(pair.key);
          			values.each(function(value) {
            			value = value != undefined ? encodeURIComponent(value) : '';
            			parts.push(key + '=' + encodeURIComponent(value));
          			});
          			return;
        		}
      		}
      		
      		if (pair.value == undefined) pair[1] = '';
      		parts.push(pair.map(encodeURIComponent).join('='));
	  	});

    	return parts.join('&');
  	}
});

Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, {
  	_each: function(iterator) {
    	for (var key in this) {
      		var value = this[key];
      		if (value && value == Hash.prototype[key]) continue;

      		var pair = [key, value];
      		pair.key = key;
      		pair.value = value;
      		iterator(pair);
    	}
  	},

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

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

  	merge: function(hash) {
    	return $H(hash).inject(this, function(mergedHash, pair) {
      		mergedHash[pair.key] = pair.value;
      		return mergedHash;
    	});
  	},

  	remove: function() {
    	var result;
    	for(var i = 0, length = arguments.length; i < length; i++) {
      		var value = this[arguments[i]];
      		if (value !== undefined){
        		if (result === undefined) result = value;
        		else {
          			if (result.constructor != Array) result = [result];
          			result.push(value)
        		}
      		}
      		delete this[arguments[i]];
    	}
    	return result;
  	},

  	toQueryString: function() {
    	return Hash.toQueryString(this);
  	},

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

function $H(object) {
  	if (object && object.constructor == Hash) return object;
  	return new Hash(object);
};

ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
  	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 (typeof responder[callback] == 'function') {
        		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 = function() {};
Ajax.Base.prototype = {
  	setOptions: function(options) {
    	this.options = {
     		method:       'post',
      		asynchronous: true,
      		contentType:  'application/x-www-form-urlencoded',
      		encoding:     'UTF-8',
      		parameters:   ''
    	}
    	Object.extend(this.options, options || {});

    	this.options.method = this.options.method.toLowerCase();
    	if (typeof this.options.parameters == 'string')
      		this.options.parameters = this.options.parameters.toQueryParams();
  	}
}

Ajax.Request = Class.create();
Ajax.Request.Events = ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
  	_complete: false,

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

  	request: function(url) {
    	this.url = url;
    	this.method = this.options.method;
    	var params = this.options.parameters;
//		alert("params-->" + params);
    	if (!['get', 'post'].include(this.method)) {
      		// simulate other verbs over post
      		params['_method'] = this.method;
      		this.method = 'post';
    	}

    	params = Hash.toQueryString(params);
    	if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='

    	// when GET, append parameters to URL
    	if (this.method == 'get' && params)
      		this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;

    	try {
      		Ajax.Responders.dispatch('onCreate', this, this.transport);

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

      		if (this.options.asynchronous)
        		setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);

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

      		var body = this.method == 'post' ? (this.options.postBody || params) : null;
//alert("body--->" + body);
      		this.transport.send(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') {
//    		alert("ddddd");
      		headers['Content-type'] = this.options.contentType +(this.options.encoding ? '; charset=' + this.options.encoding : '');
//		alert("headers['Content-type']-->" + headers['Content-type']);
      	/* 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 (typeof extras.push == 'function')
        		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() {
    	return !this.transport.status
        	|| (this.transport.status >= 200 && this.transport.status < 300);
  	},

  	respondToReadyState: function(readyState) {
    	var state = Ajax.Request.Events[readyState];
    	var transport = this.transport, json = this.evalJSON();

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

      		if ((this.getHeader('Content-type') || 'text/javascript').strip().
        		match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
          		this.evalResponse();
    	}

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

    	if (state == 'Complete') {
      		// avoid memory leak in MSIE: clean up
      		this.transport.onreadystatechange = Prototype.emptyFunction;
    	}
  	},

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

  	evalJSON: function() {
  		try {
      		var json = this.getHeader('X-JSON');
      		return json ? eval('(' + json + ')') : null;
    	} catch (e) { return null }
  	},

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

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

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
	initialize: function(container, url, options) {
    	this.container = {
    		success: (container.success || container),
      		failure: (container.failure || (container.success ? null : container))
    	}

    	this.transport = Ajax.getTransport();
    	this.setOptions(options);

    	var onComplete = this.options.onComplete || Prototype.emptyFunction;
    	this.options.onComplete = (function(transport, param) {
    		this.updateContent();
      		onComplete(transport, param);
    	}).bind(this);

    	this.request(url);
  	},

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

    	if (!this.options.evalScripts) response = response.stripScripts();

    	if (receiver = $(receiver)) {
      		if (this.options.insertion)
        		new this.options.insertion(receiver, response);
      		else
        		receiver.update(response);
    	}

    	if (this.success()) {
      		if (this.onComplete)
        		setTimeout(this.onComplete.bind(this), 10);
    	}
  	}
});

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
  	initialize: function(container, url, options) {
    	this.setOptions(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(request) {
    	if (this.options.decay) {
      		this.decay = (request.responseText == this.lastText ? this.decay * this.options.decay : 1);
      		this.lastText = request.responseText;
    	}
    	this.timer = setTimeout(this.onTimerEvent.bind(this), this.decay * this.frequency * 1000);
  	},

  	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 (typeof element == 'string')
    	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(query.snapshotItem(i));
    	return results;
  	};
}

document.getElementsByClassName = function(className, parentElement) {
	if (Prototype.BrowserFeatures.XPath) {
    	var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
    	return document._getElementsByXPath(q, parentElement);
  	} else {
    	var children = ($(parentElement) || document.body).getElementsByTagName('*');
    	var elements = [], child;
    	for (var i = 0, length = children.length; i < length; i++) {
      		child = children[i];
      		if (Element.hasClassName(child, className))
        	elements.push(Element.extend(child));
    	}
    	return elements;
  	}
};

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

if (!window.Element)
	var Element = new Object();

Element.extend = function(element) {
	if (!element || _nativeExtensions || element.nodeType == 3) return element;

  	if (!element._extended && element.tagName && element != window) {
    	var methods = Object.clone(Element.Methods), cache = Element.extend.cache;

    	if (element.tagName == 'FORM')
      		Object.extend(methods, Form.Methods);
    	if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
      		Object.extend(methods, Form.Element.Methods);

    	Object.extend(methods, Element.Methods.Simulated);

    	for (var property in methods) {
      		var value = methods[property];
      		if (typeof value == 'function' && !(property in element))
        		element[property] = cache.findOrStore(value);
    	}
  	}

  	element._extended = true;
  	return element;
};

Element.extend.cache = {
	findOrStore: function(value) {
    	return this[value] = this[value] || function() {
      		return value.apply(null, [this].concat($A(arguments)));
    	}
  	}
};

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, html) {
    	html = typeof html == 'undefined' ? '' : html.toString();
    	$(element).innerHTML = html.stripScripts();
    	setTimeout(function() {html.evalScripts()}, 10);
    	return element;
  	},

  	replace: function(element, html) {
    	element = $(element);
    	html = typeof html == 'undefined' ? '' : html.toString();
    	if (element.outerHTML) {
      		element.outerHTML = html.stripScripts();
    	} else {
      		var range = element.ownerDocument.createRange();
      		range.selectNodeContents(element);
      		element.parentNode.replaceChild(range.createContextualFragment(html.stripScripts()), element);
    	}
    	setTimeout(function() {html.evalScripts()}, 10);
    	return element;
  	},

  	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 $A($(element).getElementsByTagName('*'));
  	},

  	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 (typeof selector == 'string')
      		selector = new Selector(selector);
    	return selector.match($(element));
  	},

  	up: function(element, expression, index) {
    	return Selector.findElement($(element).ancestors(), expression, index);
  	},

  	down: function(element, expression, index) {
    	return Selector.findElement($(element).descendants(), expression, index);
  	},

  	previous: function(element, expression, index) {
    	return Selector.findElement($(element).previousSiblings(), expression, index);
  	},

  	next: function(element, expression, index) {
    	return Selector.findElement($(element).nextSiblings(), expression, index);
  	},

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

  	getElementsByClassName: function(element, className) {
    	return document.getElementsByClassName(className, element);
  	},

  	readAttribute: function(element, name) {
    	element = $(element);
    	if (document.all && !window.opera) {
      		var t = Element._attributeTranslations;
      		if (t.values[name]) return t.values[name](element, name);
      		if (t.names[name])  name = t.names[name];
      		var attribute = element.attributes[name];
      		if(attribute) return attribute.nodeValue;
    	}
    	return element.getAttribute(name);
  	},

  	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 = $(element))) return;
    	var elementClassName = element.className;
    	if (elementClassName.length == 0) return false;
    	if (elementClassName == className || elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
      		return true;
    	return false;
  	},

  	addClassName: function(element, className) {
    	if (!(element = $(element))) return;
    	Element.classNames(element).add(className);
    	return element;
  	},

  	removeClassName: function(element, className) {
    	if (!(element = $(element))) return;
    	Element.classNames(element).remove(className);
    	return element;
  	},

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

  	observe: function() {
    	Event.observe.apply(Event, arguments);
    	return $A(arguments).first();
  	},

  	stopObserving: function() {
    	Event.stopObserving.apply(Event, arguments);
   	 	return $A(arguments).first();
  	},

  	// 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 $(element).innerHTML.match(/^\s*$/);
  	},

  	descendantOf: function(element, ancestor) {
    	element = $(element), ancestor = $(ancestor);
    	while (element = element.parentNode)
      		if (element == ancestor) return true;
    	return false;
  	},

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

  	getStyle: function(element, style) {
    	element = $(element);
    	if (['float','cssFloat'].include(style))
      		style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
    	style = style.camelize();
    	var value = element.style[style];
    	if (!value) {
      		if (document.defaultView && document.defaultView.getComputedStyle) {
        		var css = document.defaultView.getComputedStyle(element, null);
        		value = css ? css[style] : null;
      		} else if (element.currentStyle) {
        		value = element.currentStyle[style];
      		}
    	}

    	if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
      		value = element['offset'+style.capitalize()] + 'px';

    	if (window.opera && ['left', 'top', 'right', 'bottom'].include(style)){
      		if (Element.getStyle(element, 'position') == 'static') value = 'auto';
    		if(style == 'opacity') {
      			if(value) return parseFloat(value);
      			if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        		if(value[1]) return parseFloat(value[1]) / 100;
      			return 1.0;
    		}
    		return value == 'auto' ? null : value;
    	}
  	},

  	setStyle: function(element, style) {
    	element = $(element);
    	for (var name in style) {
      		var value = style[name];
      		if(name == 'opacity') {
        		if (value == 1) {
          			value = (/Gecko/.test(navigator.userAgent) &&
            				!/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
          			if(/MSIE/.test(navigator.userAgent) && !window.opera)
            			element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
        		} else if(value == '') {
          			if(/MSIE/.test(navigator.userAgent) && !window.opera)
            		element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
        		} else {
          			if(value < 0.00001) value = 0;
          			if(/MSIE/.test(navigator.userAgent) && !window.opera)
            			element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +
              				'alpha(opacity='+value*100+')';
        		}
      		} else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
      		element.style[name.camelize()] = 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.style.overflow || 'auto';
    	if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
  	}
};

Object.extend(Element.Methods, {childOf: Element.Methods.descendantOf});

Element._attributeTranslations = {};

Element._attributeTranslations.names = {
	colspan:   "colSpan",
  	rowspan:   "rowSpan",
  	valign:    "vAlign",
  	datetime:  "dateTime",
  	accesskey: "accessKey",
  	tabindex:  "tabIndex",
  	enctype:   "encType",
  	maxlength: "maxLength",
  	readonly:  "readOnly",
  	longdesc:  "longDesc"
};

Element._attributeTranslations.values = {
	_getAttr: function(element, attribute) {
    	return element.getAttribute(attribute, 2);
  	},

  	_flag: function(element, attribute) {
    	return $(element).hasAttribute(attribute) ? attribute : null;
  	},

  	style: function(element) {
    	return element.style.cssText.toLowerCase();
  	},

  	title: function(element) {
    	var node = element.getAttributeNode('title');
    	return node.specified ? node.nodeValue : null;
  	}
};

Object.extend(Element._attributeTranslations.values, {
  	href: Element._attributeTranslations.values._getAttr,
  	src:  Element._attributeTranslations.values._getAttr,
  	disabled: Element._attributeTranslations.values._flag,
  	checked:  Element._attributeTranslations.values._flag,
  	readonly: Element._attributeTranslations.values._flag,
  	multiple: Element._attributeTranslations.values._flag
});

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

// IE is missing .innerHTML support for TABLE-related elements
if (document.all && !window.opera){
  	Element.Methods.update = function(element, html) {
    	element = $(element);
    	html = typeof html == 'undefined' ? '' : html.toString();
    	var tagName = element.tagName.toUpperCase();
    	if (['THEAD','TBODY','TR','TD'].include(tagName)) {
      		var div = document.createElement('div');
      		switch (tagName) {
        		case 'THEAD':
        		case 'TBODY':
          			div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
          			depth = 2;
          			break;
        		case 'TR':
          			div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
          			depth = 3;
          			break;
        		case 'TD':
          			div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
          			depth = 4;
      		}
      		$A(element.childNodes).each(function(node){
        		element.removeChild(node)
      		});
      		depth.times(function(){ div = div.firstChild });

      		$A(div.childNodes).each(function(node){ element.appendChild(node) });
    	} else {
      		element.innerHTML = html.stripScripts();
    	}
    	setTimeout(function() {html.evalScripts()}, 10);
    	return element;
  	}
};

Object.extend(Element, Element.Methods);

var _nativeExtensions = false;

if(/Konqueror|Safari|KHTML/.test(navigator.userAgent)){
  	['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {
    	var className = 'HTML' + tag + 'Element';
    	if(window[className]) return;
    	var klass = window[className] = {};
    	klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;
  	});
}

Element.addMethods = function(methods) {
  	Object.extend(Element.Methods, methods || {});

  	function copy(methods, destination, onlyIfAbsent) {
    	onlyIfAbsent = onlyIfAbsent || false;
    	var cache = Element.extend.cache;
    	for (var property in methods) {
      		var value = methods[property];
      		if (!onlyIfAbsent || !(property in destination))
        		destination[property] = cache.findOrStore(value);
    	}
  	}

  	if (typeof HTMLElement != 'undefined') {
    	copy(Element.Methods, HTMLElement.prototype);
    	copy(Element.Methods.Simulated, HTMLElement.prototype, true);
    	copy(Form.Methods, HTMLFormElement.prototype);
    	[HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {
      		copy(Form.Element.Methods, klass.prototype);
    	});
    	_nativeExtensions = true;
  	}
}

var Toggle = new Object();
Toggle.display = Element.toggle;

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

Abstract.Insertion = function(adjacency) {
  	this.adjacency = adjacency;
}

Abstract.Insertion.prototype = {
  	initialize: function(element, content) {
    	this.element = $(element);
    	this.content = content.stripScripts();

    	if (this.adjacency && this.element.insertAdjacentHTML) {
      		try {
        		this.element.insertAdjacentHTML(this.adjacency, this.content);
      		} catch (e) {
        		var tagName = this.element.tagName.toUpperCase();
        		if (['TBODY', 'TR'].include(tagName)) {
          			this.insertContent(this.contentFromAnonymousTable());
        		} else {
          			throw e;
        		}
      		}
    	} else {
      		this.range = this.element.ownerDocument.createRange();
      		if (this.initializeRange) this.initializeRange();
      		this.insertContent([this.range.createContextualFragment(this.content)]);
    	}

    	setTimeout(function() {content.evalScripts()}, 10);
  	},

  	contentFromAnonymousTable: function() {
    	var div = document.createElement('div');
    	div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
    	return $A(div.childNodes[0].childNodes[0].childNodes);
  	}
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
  	initializeRange: function() {
    	this.range.setStartBefore(this.element);
  	},

  	insertContent: function(fragments) {
    	fragments.each((function(fragment) {
      		this.element.parentNode.insertBefore(fragment, this.element);
    	}).bind(this));
  	}
});

Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
  	initializeRange: function() {
    	this.range.selectNodeContents(this.element);
    	this.range.collapse(true);
  	},

  	insertContent: function(fragments) {
    	fragments.reverse(false).each((function(fragment) {
      		this.element.insertBefore(fragment, this.element.firstChild);
    	}).bind(this));
  	}
});

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
  	initializeRange: function() {
    	this.range.selectNodeContents(this.element);
    	this.range.collapse(this.element);
  	},

  	insertContent: function(fragments) {
    	fragments.each((function(fragment) {
      		this.element.appendChild(fragment);
    	}).bind(this));
  	}
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
  	initializeRange: function() {
    	this.range.setStartAfter(this.element);
  	},

  	insertContent: function(fragments) {
    	fragments.each((function(fragment) {
      		this.element.parentNode.insertBefore(fragment,
       	 	this.element.nextSibling);
    	}).bind(this));
  	}
});

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

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);
var Selector = Class.create();
Selector.prototype = {
  	initialize: function(expression) {
    	this.params = {classNames: []};
    	this.expression = expression.toString().strip();
    	this.parseExpression();
    	this.compileMatcher();
  	},

  	parseExpression: function() {
    	function abort(message) { throw 'Parse error in selector: ' + message; }

    	if (this.expression == '')  abort('empty expression');

    	var params = this.params, expr = this.expression, match, modifier, clause, rest;
    	while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
      		params.attributes = params.attributes || [];
      		params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
      		expr = match[1];
    	}

    	if (expr == '*') return this.params.wildcard = true;

    	while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
      		modifier = match[1], clause = match[2], rest = match[3];
      		switch (modifier) {
        		case '#':       params.id = clause; break;
        		case '.':       params.classNames.push(clause); break;
        		case '':
        		case undefined: params.tagName = clause.toUpperCase(); break;
        		default:        abort(expr.inspect());
      		}
      		expr = rest;
    	}

    	if (expr.length > 0) abort(expr.inspect());
  	},

  	buildMatchExpression: function() {
    	var params = this.params, conditions = [], clause;

    	if (params.wildcard)
      		conditions.push('true');
    	if (clause = params.id)
      		conditions.push('element.readAttribute("id") == ' + clause.inspect());
    	if (clause = params.tagName)
      		conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
    	if ((clause = params.classNames).length > 0)
      		for (var i = 0, length = clause.length; i < length; i++)
        		conditions.push('element.hasClassName(' + clause[i].inspect() + ')');
    	if (clause = params.attributes) {
      		clause.each(function(attribute) {
        		var value = 'element.readAttribute(' + attribute.name.inspect() + ')';
        		var splitValueBy = function(delimiter) {
          			return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
        		}

        		switch (attribute.operator) {
          			case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
          			case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
          			case '|=':      conditions.push(
                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
                          ); break;
          			case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
          			case '':
          			case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;
          			default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
        		}
      		});
    	}
    	return conditions.join(' && ');
  	},

  	compileMatcher: function() {
    	this.match = new Function('element', 'if (!element.tagName) return false; \
      		element = $(element); \
      		return ' + this.buildMatchExpression());
  	},

  	findElements: function(scope) {
    	var element;

    	if (element = $(this.params.id))
      		if (this.match(element))
        		if (!scope || Element.childOf(element, scope))
          			return [element];

    	scope = (scope || document).getElementsByTagName(this.params.tagName || '*');

    	var results = [];
    	for (var i = 0, length = scope.length; i < length; i++)
      		if (this.match(element = scope[i]))
        		results.push(Element.extend(element));

    	return results;
  	},

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

Object.extend(Selector, {
  	matchElements: function(elements, expression) {
    	var selector = new Selector(expression);
    	return elements.select(selector.match.bind(selector)).map(Element.extend);
  	},

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

  	findChildElements: function(element, expressions) {
    	return expressions.map(function(expression) {
      		return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {
        		var selector = new Selector(expr);
        		return results.inject([], function(elements, result) {
          			return elements.concat(selector.findElements(result || element));
        		});
      		});
    	}).flatten();
  	}
});

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}

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

  	serializeElements: function(elements, getHash) {
    	var data = elements.inject({}, function(result, element) {
      		if (!element.disabled && element.name) {
        		var key = element.name, value = $(element).getValue();
        		if (value != undefined) {
          			if (result[key]) {
            			if (result[key].constructor != Array) result[key] = [result[key]];
            			result[key].push(value);
          			}
          			else result[key] = value;
        		}
      		}
      	return result;
    	});

    	return getHash ? data : Hash.toQueryString(data);
  	}
};

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

  	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().each(function(element) {
      		element.blur();
      		element.disabled = 'true';
    	});
    	return form;
  	},

  	enable: function(form) {
    	form = $(form);
    	form.getElements().each(function(element) {
      		element.disabled = '';
    	});
    	return form;
  	},

  	findFirstElement: function(form) {
    	return $(form).getElements().find(function(element) {
      		return element.type != 'hidden' && !element.disabled &&
        		['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    	});
  	},

  	focusFirstElement: function(form) {
    	form = $(form);
    	form.findFirstElement().activate();
    	return form;
  	}
}

Object.extend(Form, Form.Methods);

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

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 Hash.toQueryString(pair);
      		}
    	}
    	return '';
  	},

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

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

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

  	activate: function(element) {
    	element = $(element);
    	element.focus();
    	if (element.select && ( element.tagName.toLowerCase() != 'input' ||
      		!['button', 'reset', 'submit'].include(element.type) ) )
      	element.select();
    	return element;
  	},

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

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

Object.extend(Form.Element, Form.Element.Methods);
var Field = Form.Element;
var $F = Form.Element.getValue;

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

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

  	inputSelector: function(element) {
    	return element.checked ? element.value : null;
  	},

  	textarea: function(element) {
    	return element.value;
  	},

  	select: function(element) {
    	return this[element.type == 'select-one' ? 'selectOne' : 'selectMany'](element);
  	},

  	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 = function() {}
Abstract.TimedObserver.prototype = {
  	initialize: function(element, frequency, callback) {
    	this.frequency = frequency;
    	this.element   = $(element);
    	this.callback  = callback;

    	this.lastValue = this.getValue();
    	this.registerCallback();
  	},

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

  	onTimerEvent: function() {
    	var value = this.getValue();
    	var changed = ('string' == typeof this.lastValue && 'string' == typeof value
      		? this.lastValue != value : String(this.lastValue) != String(value));
    	if (changed) {
      		this.callback(this.element, value);
      		this.lastValue = value;
    	}
  	}
}

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

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

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

Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
  	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.bind(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();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
  	getValue: function() {
    	return Form.Element.getValue(this.element);
  	}
});

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

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

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,

  	element: function(event) {
    	return event.target || event.srcElement;
  	},

  	isLeftClick: function(event) {
    	return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 1)));
  	},

  	pointerX: function(event) {
    	return event.pageX || (event.clientX +
      		(document.documentElement.scrollLeft || document.body.scrollLeft));
  	},

  	pointerY: function(event) {
    	return event.pageY || (event.clientY +
      	(document.documentElement.scrollTop || document.body.scrollTop));
  	},

  	stop: function(event) {
    	if (event.preventDefault) {
      		event.preventDefault();
      		event.stopPropagation();
    	} else {
      		event.returnValue = false;
      		event.cancelBubble = true;
    	}
  	},

  	// find the first node with the given tagName, starting from the
  	// node the event was triggered on; traverses the DOM upwards
  	findElement: function(event, tagName) {
    	var element = Event.element(event);
    	while (element.parentNode && (!element.tagName ||
        	(element.tagName.toUpperCase() != tagName.toUpperCase())))
      		element = element.parentNode;
    	return element;
  	},

  	observers: false,

  	_observeAndCache: function(element, name, observer, useCapture) {
    	if (!this.observers) this.observers = [];
    	if (element.addEventListener) {
      		this.observers.push([element, name, observer, useCapture]);
      		element.addEventListener(name, observer, useCapture);
    	} else if (element.attachEvent) {
      		this.observers.push([element, name, observer, useCapture]);
      		element.attachEvent('on' + name, observer);
    	}
  	},

  	unloadCache: function() {
    	if (!Event.observers) return;
    	for (var i = 0, length = Event.observers.length; i < length; i++) {
      		Event.stopObserving.apply(this, Event.observers[i]);
      		Event.observers[i][0] = null;
    	}
    	Event.observers = false;
  	},

  	observe: function(element, name, observer, useCapture) {
    	element = $(element);
    	useCapture = useCapture || false;

    	if (name == 'keypress' &&
        	(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        		|| element.attachEvent))
      		name = 'keydown';

    	Event._observeAndCache(element, name, observer, useCapture);
  	},

  	stopObserving: function(element, name, observer, useCapture) {
    	element = $(element);
    	useCapture = useCapture || false;

    	if (name == 'keypress' &&
        	(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        		|| element.detachEvent))
      		name = 'keydown';

    	if (element.removeEventListener) {
      		element.removeEventListener(name, observer, useCapture);
    	} else if (element.detachEvent) {
      		try {
        		element.detachEvent('on' + name, observer);
      		} catch (e) {}
    	}
  	}
});

/* prevent memory leaks in IE */
if (navigator.appVersion.match(/\bMSIE\b/))
  	Event.observe(window, 'unload', Event.unloadCache, false);
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;
  	},

  	realOffset: function(element) {
    	var valueT = 0, valueL = 0;
    	do {
      		valueT += element.scrollTop  || 0;
      		valueL += element.scrollLeft || 0;
      		element = element.parentNode;
    	} while (element);
    	return [valueL, valueT];
  	},

  	cumulativeOffset: function(element) {
    	var valueT = 0, valueL = 0;
    	do {
      		valueT += element.offsetTop  || 0;
      		valueL += element.offsetLeft || 0;
      		element = element.offsetParent;
    	} while (element);
    	return [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 == 'relative' || p == 'absolute') break;
      		}
    	} while (element);
    	return [valueL, valueT];
  	},

  	offsetParent: 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;
  	},

  	// 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 = this.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 = this.realOffset(element);

    	this.xcomp = x + offsetcache[0] - this.deltaX;
    	this.ycomp = y + offsetcache[1] - this.deltaY;
    	this.offset = this.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;
  	},

  	page: 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)
        		if (Element.getStyle(element,'position')=='absolute') break;

    	} while (element = element.offsetParent);

    	element = forElement;
    	
    	do {
      		if (!window.opera || element.tagName=='BODY') {
        		valueT -= element.scrollTop  || 0;
        		valueL -= element.scrollLeft || 0;
      		}
    	} while (element = element.parentNode);

    	return [valueL, valueT];
  	},

  	clone: function(source, target) {
    	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 = Position.page(source);

    	// find coordinate system to use
    	target = $(target);
    	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(target,'position') == 'absolute') {
      		parent = Position.offsetParent(target);
      		delta = Position.page(parent);
    	}

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

  	absolutize: function(element) {
    	element = $(element);
    	if (element.style.position == 'absolute') return;
    	Position.prepare();

    	var offsets = Position.positionedOffset(element);
    	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';
  	},

  	relativize: function(element) {
    	element = $(element);
    	if (element.style.position == 'relative') return;
    	Position.prepare();

    	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;
  	}
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.  For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
  	Position.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 [valueL, valueT];
  	}
}

Element.addMethods();