[vchkpw] qmailadmin and authentication

[Nope shape]

Hi to all, i created a php panel with authentication for other purposes than emailadmin. I would like to include qmailadmin with no modify but i wouldn't like that users that authenticated on my php panel must re-authenticate with qmailadmin. So how can i disable qmailadmin authentication or pass to it the authentication automatically with no ask to the user?   thanks in advance Nicolas