[Octane]

var addEvent = document.addEventListener ? function (element, eventType, listener, useCapturing) {
	element.addEventListener(eventType, listener, useCapturing == true);
	return listener;
} : function (element, eventType, listener) {
	var _listener = function () {
		listener.call(element, window.event)
	};
	element.attachEvent("on" + eventType, _listener);
	return _listener;
};