Session_destroy() HELP!

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I have a multiple page script which uses sessions to allow the user to enter data, the data is written to a MySQL db, and then returns the suer back to the entry page. Ater writing the inputted data to the db I would like to destroy the session (I have the page re-direct so that the ehaders are at the top of the file). However I can not seem to destroy the session without the user closing the browser window (YUCK). I am using cookies to pass the SID and GLOBALS are set to on.

In other words, How do you destroy a session without having the user close the browser window?

cahva

I have this for my logout-pages, hope it helps you:

<?php
header ("Cache-Control: no-cache, must-revalidate");
session_start();
session_unset();
session_destroy();
print '
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
self.top.location.href="index.htm";
//-->
</SCRIPT>
</HEAD></HTML>
';
exit;
?>