Getting logged out

[Chris Beattie <supaboy sc rr com>]

Hello all,

Since I installed Helix Gnome, I get logged out if I let a session sit
for a long time.  It's never done it while I've been using the system. 
If I leave the computer but stay logged in for a few hours, I usually
come back to a gdm screen.

Gnome didn't do this before.  Can you tell me how to fix this?  I'm
running Red Hat 6.2 on x86, Helix Gnome, and XFree86 4.0.

Thanks,
-Chris