Replace user Data when logout

Hi, On a public surf station i wanted to allow a guest user using a session and after an (automatical) logout all his userdata to replace and have a fresh clean session for the next user. I did this by modifying /etc/gdm/PostSession/Default. I simply added something like: rm -rf /home/guest cp -af /home/backup /home/guest

By the way I am using Ubuntu 8.10. I thought all left over guest user data will deleted and everything (including icon position etc) will be restored. If I do this manually everything worked like I expected. But in the Logout Script, it seams that some files are not deletable. (maybe still in use) and I run into strange things, and often the computer is using a new default home directory for guest.

So how can i realize this working? Is there maybe a better location for my script? Or a better way of doing this? Guests home in an temporal dataspace? Thanks for the help Guido

Can you use the guest session option available 8.10?

Guest session

The User Switcher panel applet (package fast-user-switch-applet) now provides an extra entry for starting a Guest session (by Martin Pitt). This creates a temporary password-less user account with restricted privileges: the account cannot access any users' home directories, nor permanently store data. This is sufficiently safe to lend your laptop to someone else for a quick email check.

I would love to use the Guest session, but I think it is not acessible from GDM Login? On the Machines the Users have to login themselves. Or is there a way to use it?

Greetings Guido