need to run shell script at gdm log out

["BlueSky77" <user=1518@nabble.blu.org>]

 I'm looking for a way to run a shell script automatically 
every time a user logs out of Gnome or attempts to shut down 
the computer. Is this possible? 

What I'm trying to do is to back up the users home directory 
to a back up directory on a server, every time the user 
initiates a shut down. 

If there is no way to run the shell script so that it will 
execute on gdm log out, then is it possible to create a shell 
script that would rsync the users home directory to the 
server, then upon successful completion of the backup, shut 
down the computer? That seems like the best way to go as I 
could create a shortcut to run the backup/shutdown shell 
script and replace the logout/shutdown button on their Gnome 
desktop. 

The desktops are running Ubuntu Gutsy. Any help would be much 
appreciated! 

Thanks! 
Mike 

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