questions about applets gdm and su

[cyberclay <cclay fastlane net>]

Hey,
  I installed a few new applets and I'm having trouble executing them.
After the installation of netleds_applet, for example, I found it in
the applet menu but when I click on it nothing happens.
  Another question..normally I can switch to virtual console number
one to see what errors have occurred (if I startx in virtual console
number one).  Now, I'm using gdm and I don't know how to see the
errors. . . is there a program that will let me do this?
  If I open a gnome terminal as a normal user and then su to root
(by typing "su -") I can't run any x-windows programs..they all
give me this error:
Error: Can't open display:

  Pleasehelpme.

Regards,
  cyberclay
---
cclay at fastlane dot net
http://www.abednego.com