define([

], function (

) {
	var events = {
		events: {},

		on: function (event, callback) {
			var list = this.events[event] || (this.events[event] = []);
			list.push(callback);

			return callback;
		},

		off: function (event, callback) {
			var list = this.events[event] || [];
			var lLen = list.length;
			for (var i = 0; i < lLen; i++) {
				if (list[i] == callback) {
					list.splice(i, 1);
					i--;
					lLen--;
				}
			}

			if (lLen == 0)
				delete this.events[event];
		},

		emit: function (event) {
			var args = [].slice.call(arguments, 1);

			var list = this.events[event];
			if (!list)
				return;

			var len = list.length
			for (var i = 0; i < len; i++) {
				var l = list[i];
				l.apply(null, args);
			}
		}
	};

	return events;
});