hi,
i have already tried this!
As you said it is working fine on IE while close the browse window, but when i have tested for this while the user click browser back button, it does not support.

But i need to support both the browser (IE and FF)

Another issue for this is when the user change the url from address bar then how can we track the user login?

__________________
With,
J. Jeyaseelan
Everything Possible