Auth class question (preserve user authentication across scripts)

Hi, I'd like to ask some help to resolve this problem: I've a home page with a left frame, and a central frame. In the left frame I authenticate the user (script left.php) when the user is authenticated, left.php say "hello user" instead of the login form: so I'm sure that the user is authenticated. In the left.php output page there's a link to modify.php with target in the central frame. In the mod.php I re-instantiate the auth class, but when I do getAuth() there's no user logged in !!! So how to enter in another script and re-use the session information create by the login script (left.php) ? I've to transmit a session ID (and where's) with a mod.php?ID=##### ??? thanks in advance, Carlo I've also tried something like addUser(), but I think it handles to create something like "current logged users". (or not?) why auth class has +/- null documentation? _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com