Fw: su in X

["Erik van der Meulen" <e.van.der.meulen@dices.nl>]

Dear list, this should be easy, but I have not managed yet...
I run Gnome desktop as a 'regular' user. If I need to do systemsmanagment, I
do 'su -' in a terminal to get root access. Only if I need to start an X app
(just installed red-carper), I get an error:

  Gtk-WARNING **: cannot open display:

Can anyone suggest how to avoid this? I recall something with export
display, but do not get it to work...

Thanks a lot.

Erk van der Meulen

NB I probably end up wanting to have a menu-button for this application. Is
'sudo' than the way to go?