How do you log a user out when they close a browser or the session ends?

[jeff_borden]

Hi...
I am working on something and I want to know if it's possible to log someone out when they close their browser?? Also, can you run a query that logs them out if their session times out?

I have it set up right now where when a user navigates to another page after the session has timed out, they get logged out.:

$query2 = "UPDATE users SET online = 'n' WHERE username = '$user'";
$result2 = mysql_query($query2);
session_destroy();

Is there away to do it when they aren't navigating or they close a window. Thank you for your help....

[scarabatwork]

In IE you can use the event: onBeforeUnload to open window, run the logout script, then close itsself, but I don't know what the equivilant is for other browsers.