i have a login page for students .After the students login, their details such as UId,FNAMe,LNAME  and login time are entered into the database .After logging out their logout time is updated in the database(Enterprise Manager).
But some students logout after viewing their page by closing the browser window instead of clicking on the logout button.So their logout time is not shown in the database and it shows NULL.
What shud be done to capture the logout time of the students even when they close their window?

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you cannot accurately capture window close event
May wish to read these

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
function RorC() {

var top=self.screenTop;
if (top>9000)
{alert('window was closed')}
{alert('window was Refreshed')}


<BODY BGCOLOR="#FFFFFF" onunload="javascript:if (document.all){RorC()} else {var top=window.outerWidth;if (top==0) {opener.alert('window was closed')} else {opener.alert('window was Refreshed')}}">
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I would do a check upon next login to see if they logged out last time, if not, I would display a nice big message explaining to them why they should log out (Security and all that) and give them a friendly reminder...

Thats about the best you can do.
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