error with su and X

Message-ID: <3A2E36C9.EE0AE416@citeweb.net> Date: Wed, 06 Dec 2000 13:53:29 +0100 From: charlie ti <shadout@citeweb.net> Subject: error with su and X Hi, When i want to launch an application under X with su i've got this error message : lib: connection to ":0.0" refused by server Xlib: Client is not authorized to connect to Server qt: cannot connect to X server :0.0 What is it ? Thanks