SuSE 8.2 X permisions

Hi,

I guess this is off-topic I'm sure somebody in this list knows about how 
to fix this problem.  Anyway, here goes...

I've just installed SuSE 8.2 on my Vaio PCG-GR5F/BP (Japanese model) and 
everything works great (except the modem, but I don't need it this time 
anyway).  However, when I do su in a konsole terminal and run X 
applications, e.g. emacs, I get this error message:

allister@ngtalx:~> su
Password:
ngtalx:/home/allister # emacs
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

emacs: Cannot connect to X server :0.0.
Check the DISPLAY environment variable or use `-d'.
Also use the `xhost' program to verify that it is set to permit
connections from your machine.

ngtalx:/home/allister #

It's my first time ever with SuSE (it's always been Red Hat or Mandrake) 
so I wonder if somebody could tell me how to fix this in the proper way.

Thanks in advance,

Allister Levi Sanchez
Niigata, Japan