server to be notified when browser closes

when user closes the browser, I want server to be notified.
If I use <BODY onUnLoad="javascript:notifyServer()"> , this will be called everytime when user request for another page.
How to achieve above functionality in Microsoft Internet explorer.

check for window.closed property of window object

This is one of the most often asked questions in the forum... Do a search and you should be able to find more info.
The main point is that you can't be guaranteed that your server will be notified everytime a browser is closed, so don't count on it.

what u really want to do by knowing the browser closing?

You don't know when the user closes the browser. This is why you have a session timeout. There is no way to tell from the server side if the user has already left or not until the session has timed out.
-Dale