event.toElement in IE8 and Firefox?

I met a issue when I use Jay's answer, event.target on firefox points to the parent element of event.toElement's target on chrome.
After looking into the event obj, I find event.originalEvent.target, it works good on both firefox and chrome.

In Firefox it is event.relatedTarget https://developer.mozilla.org/en/DOM:event.relatedTarget#1003983

Instead of event.toElement you should use this:

event.target