Object that handles custom events in Javascript

EventManager.js

/*EXAMPLE CODE
var tObj = {val:"woot",func:function(){ console.log(this.val); console.log(arguments); }}

var evt = new EventManager("onprogress","oncomplete");
evt.addEventListener("onprogress",function(){ console.log(arguments); });
evt.addEventListenerDelegate("onprogress",tObj,tObj.func);

evt.dispatchEvent("onprogress",[1,3]);
*/

var EventManager = function(){
	this.Handlers = {};
	for(var i=0; i < arguments.length; i+=1) this.Handlers[arguments[i]] = [];
};//func

EventManager.prototype.addEventListener = function(evtName,funcHandler){
	if(this.Handlers[evtName] === undefined) return false;
	this.Handlers[evtName].push(funcHandler);
	return true;
};//func

EventManager.prototype.addEventListenerDelegate = function(evtName,objRef,funcHandler){
	if(this.Handlers[evtName] === undefined) return false;
	
	this.Handlers[evtName].push(function(){ funcHandler.apply(objRef,arguments); });
	return true;
};//func

EventManager.prototype.dispatchEvent = function(evtName,ary){
	for(var i = 0; i < this.Handlers[evtName].length; i++){
		try{
			this.Handlers[evtName][i].apply(this,ary);
		}catch(err){
			console.log("error dispatching event");
			console.log(err);
		}//try
	}//for
};//func