Edit login window with custom message

[Dave Martini 1]

Anyone know how to modify the login/gnome window on RHEL 3 so
that I can add a custom message to the login window screen
where the username prompt is?

On Solaris hosts this file gets edited to add custom messages

/usr/dt/config/C/Xresources

I see this file on Linux

/etc/X11/Xresources

but can't tell it's what I need to edit.

Thanks much.
Dave Martini