polyfill-eventListener.js

!window.addEventListener && (function (WindowPrototype, DocumentPrototype, ElementPrototype, addEventListener, removeEventListener, dispatchEvent, registry) {
	WindowPrototype[addEventListener] = DocumentPrototype[addEventListener] = ElementPrototype[addEventListener] = function (type, listener) {
		var target = this;

		registry.unshift([target, type, listener, function (event) {
			event.currentTarget = target;
			event.preventDefault = function () { event.returnValue = false };
			event.stopPropagation = function () { event.cancelBubble = true };
			event.target = event.srcElement || target;

			listener.call(target, event);
		}]);

		this.attachEvent("on" + type, registry[0][3]);
	};

	WindowPrototype[removeEventListener] = DocumentPrototype[removeEventListener] = ElementPrototype[removeEventListener] = function (type, listener) {
		for (var index = 0, register; register = registry[index]; ++index) {
			if (register[0] == this && register[1] == type && register[2] == listener) {
				return this.detachEvent("on" + type, registry.splice(index, 1)[0][3]);
			}
		}
	};

	WindowPrototype[dispatchEvent] = DocumentPrototype[dispatchEvent] = ElementPrototype[dispatchEvent] = function (eventObject) {
		return this.fireEvent("on" + eventObject.type, eventObject);
	};
})(Window.prototype, HTMLDocument.prototype, Element.prototype, "addEventListener", "removeEventListener", "dispatchEvent", []);