cannot open display

[belahcene abdelkader <belahcene@yahoo.com>]

hi, 
in some distro ( like unbutu : debian-like), when I
use the su -  from the normal user to run an
administartor command , I get cannot open display: 0.0
I give the access  with xhost +,( in the normal user )
but the problem remains 
this is an example:

 as a normal login user:

bela@inst177:~ $ xhost +
access control disabled, clients can connect from any
host
bela@inst177:~ $

as a root now

bela@inst177:~ $ su -
Password:
root@inst177:~ #
/usr/local/mozilla-installer/mozilla-installer

Gtk-WARNING **: cannot open display: 0.0
root@inst177:~ #

best regards
bela


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