kompare as root

[thanksforfish]

Hi - I am trying to compare 2 config files using kompare. The files are only readable as root. I am logged into kde as a non-root user. When I su to root and run kompare (or any kde app) I get :

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

kompare: cannot connect to X server :0.0

How can I solve this (aside from logging into kde as root) ?

Thanks.

[rac]

Does this work?