[SOLVED] Exclude sidebar for logged-in user

Jugglead,

first of all you are a star of this forum -- I just sent you a small token of appreciation.

I saw your earlier reply to a question about how to reverse the include/exclude logic for sidebar inclusion (ie. to have the "exclude sidebar on pages X" become "include sidebar on pages X". My question a bit different, I want to EXCLUDE the sidebar for all logged-in users (it's a membership site and for non-logged in users I want to show advertisements). I would setup a right sidebar for all my posts and then tweak that with a

if(... && !is_user_logged_in() ) {
Show the sidebar...

I am hoping you can point me in the right direction

thanks!