Mootools Events modification

eventsmod.js

var Events = new Class({
	Extends: Events,
	$events: {},

	addEvent: function(type, fn, internal){
		var events = this.$events[type] = this.$events[type] || [];
		if(events == 1){
			fn(); 
			return this;
		} else {
			return this.parent(type,fn,internal);
		}
	},
	
	fireOnce: function(type){
		this.fireEvent(type);
		this.$events[type] = 1;
	}
});