//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}

//
//	addEvent()
//	http://www.dustindiaz.com/rock-solid-addevent/
//
function addEvent(obj, type, fn) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	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] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}
var EventCache = function(){
	var listEvents = [];
	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function(){
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				};
				item[0][item[1]] = null;
			};
		}
	};
}();
addEvent(window,'unload',EventCache.flush);

// user agent detection
if (typeof(User) == "undefined") { User = {}; }
User.Detector = {

	getAgent: function() {
		return navigator.userAgent.toLowerCase();
	},
	
	// detect platform
	isMac: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/mac/i);
	},
	
	isWin: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/win/i);
	},
	
	isWin2k: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return this.isWin(agent) && (agent.match(/nt\s*5/i));
	},
	
	isWinVista: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return this.isWin(agent) && (agent.match(/nt\s*6/i));
	},
	
	// detect browser
	isWebKit: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/AppleWebKit/i);
	},
	
	isOpera: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/opera/i);
	},
	
	isIE: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/msie/i);
	},
	
	isIEStrict: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/msie/i) && !this.isOpera(agent);
	},
	
	isFirefox: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/firefox/i);
	},

	isiPhone: function(userAgent) {
		var agent = userAgent || this.getAgent();
		return agent.match(/iPhone/i);
	}
};