X problem as root

[Marco Calviani]

Hi everybody,
 i've got a problem whenever i become root and try to open a window in 
my user X session:

for example:

[EMAIL PROTECTED]:~$ su
[EMAIL PROTECTED]:~$ eog
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified


Does anybody can diagnose the problem?

Thanks,
MC


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