isMozilla = ('undefined' != typeof(document.implementation)) && 
            ('undefined' != typeof(document.implementation.createDocument)) && 
            ('undefined' != typeof(HTMLDocument));
            
if (true == isMozilla) {
    
    Event.prototype.__defineSetter__("returnValue", function (b) {
		if (!b) this.preventDefault();
		return b;
	});


	Event.prototype.__defineSetter__("cancelBubble", function (b) {
		if (b) this.stopPropagation();
		return b;
	});

	Event.prototype.__defineGetter__("srcElement", function () {
		var node = this.target;
		while (node.nodeType != 1) node = node.parentNode;
		return node;
	});


	Event.prototype.__defineGetter__("fromElement", function () {
		var node;
		if (this.type == "mouseover")
			node = this.relatedTarget;
		else if (this.type == "mouseout")
			node = this.target;
		if (!node) return;
		while (node.nodeType != 1) node = node.parentNode;
		return node;
	});


	Event.prototype.__defineGetter__("toElement", function () {
		var node;
		if (this.type == "mouseout")
			node = this.relatedTarget;
		else if (this.type == "mouseover")
			node = this.target;
		if (!node) return;
		while (node.nodeType != 1) node = node.parentNode;
		return node;
	});


	Event.prototype.__defineGetter__("offsetX", function () {
		return this.layerX;
	});

	Event.prototype.__defineGetter__("offsetY", function () {
		return this.layerY;
	});


	
    HTMLDocument.prototype.attachEvent =
	HTMLElement.prototype.attachEvent = function (sType, fHandler) {
		var shortTypeName = sType.replace(/on/, "");
		fHandler._ieEmuEventHandler = function (e) {
			window.event = e;
			return fHandler();
		};
		this.addEventListener(shortTypeName, fHandler._ieEmuEventHandler, false);
	};



	HTMLDocument.prototype.detachEvent =
	HTMLElement.prototype.detachEvent = function (sType, fHandler) {
		var shortTypeName = sType.replace(/on/, "");
		if (typeof fHandler._ieEmuEventHandler == "function")
			this.removeEventListener(shortTypeName, fHandler._ieEmuEventHandler, false);
		else
			this.removeEventListener(shortTypeName, fHandler, true);
	};
    
}