var Browser = {
	detect: function() {
	var UA = navigator.userAgent;
		this.isKHTML = /Konqueror|Safari|KHTML/.test(UA);
		this.isGecko = (/Gecko/.test(UA) && !this.isKHTML);
		this.isOpera = /Opera/.test(UA);
		this.isMSIE  = (/MSIE/.test(UA) && !this.isOpera);
	}
}
Browser.detect();

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function addEvent( obj, type, fn ) {
	if (obj.addEventListener)
		obj.addEventListener( type, fn, false );
	else if (obj.attachEvent) {
		obj['e'+type+fn] = fn;
		obj[type+fn] = function() { obj['e'+type+fn]( window.event ); }
		obj.attachEvent( 'on'+type, obj[type+fn] );
	}
}

function removeEvent( obj, type, fn ) {
	if (obj.removeEventListener)
		obj.removeEventListener( type, fn, false );
	else if (obj.detachEvent) {
		obj.detachEvent( 'on'+type, obj[type+fn] );
		obj[type+fn] = null;
		obj['e'+type+fn] = null;
	}
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

Array.prototype.random = function() {
	return this[Math.floor((Math.random()*this.length))];
}