ListenersHelper.js

var ListenersHelper = function(){
	this._listeners = {};
};

ListenersHelper.prototype.on = function(event, callback){
	if(typeof this._listeners[event] !== 'object'){
		this._listeners[event] = [];
	}
	this._listeners[event].push(callback);
};

ListenersHelper.prototype.off = function(event, callback){
	var listeners = this._listeners[event],
		idx = listeners.indexOf(callback);
	if(typeof listeners === 'object' && idx !== -1){
		this._listeners[event].splice(idx, 1);
	}
};

ListenersHelper.prototype.triggerEvent = function(event, argsArr){
	var listeners = this._listeners[event];
	if(typeof listeners === 'object'){
		for(var i = 0, l = listeners.length; i < l; i++){
			listeners[i].apply(null, argsArr);
		}
	}
};