Hri7566

var EventEmitter = function() {
	this._events = {};
};
EventEmitter.prototype.on = function(evtn, fn) {
	if(!this._events.hasOwnProperty(evtn)) this._events[evtn] = [];
	this._events[evtn].push(fn);
};
EventEmitter.prototype.off = function(evtn, fn) {
	if(!this._events.hasOwnProperty(evtn)) return;
	var idx = this._events[evtn].indexOf(fn);