note 22377 added to ref.session

I'm new to sessions and could do with some help!! After I have destroyed the session, of which I have a username and password registered, with 'session_destroy' function, if the user clicks 'Back' a few times and refreshes the page, they are logged in again. Is there a reason for this and is there a solution that doesn't involve cookies?? Thanks Andy -- http://www.php.net/manual/en/ref.session.php http://master.php.net/manage/user-notes.php?action=edit+22377 http://master.php.net/manage/user-notes.php?action=delete+22377 http://master.php.net/manage/user-notes.php?action=reject+22377