browser close button event

Question

Hi..

how to write code on browser close button event ..
 i want to log out user and change his status in Database even if he hit the close button of the browser.


I tried this by using page unload event..Its working..But I have some problem in this...
If I refresh the page,this event also gt working(ie, Code for browser close button also works)..
Any other solution for doing this??...





Thanks in advance...