In lots of plac of interface library, following code is used,

---quote---

if (window.event) {

window.event.cancelBubble = true;

window.event.returnValue = false;

} else {

e.preventDefault();

e.stopPropagation();

}

return false;

--endquote----

I find that this is not necessary, because jquery already normalized the event object, just safely use e.preventDefault() and remove the the quoted code, it works in IE and firefox. This make the code cleaner.