How to enable logout/halt/reboot as ordinary user?

[Svante Signell <svante signell telia com>]

Hello,

I have been running redhat rawhide with enlightenment and gnome for
some time now. Recently another machine got debian slink installed,
upgraded to potato. In rawhide an ordinary user can log out of X,
reboot or halt the computer, just by supplying the user password. How
to enable this also in potato? (In potato the logout button in the
gnome panel only enable you to exit from X!)

svante.signell@telia.com