There was a logon script at
www.webwizguide.info at some point - it seems to
have been removed.
Anyway you need to find a log on script suitable to your server, before you
can have users log off.
Try
www.hotscripts.com for user-management type scripts.
If you use the .htaccess/.httpasswd functions of a Linux server, there is no
effective "log out" function - you just close the browser window, and the
next time you access the page, it will prompt for the password again.
If you use the Frontpage/Windows password protected folders function - this
might sort of work in the same way as above, as in there's no "log off"
routine.
What sort of log on script do you use?
I use a log on script and use the following asp for log-out:
<%
session.abandon
response.redirect("default.asp")
%>