Facebooker talk - Mar 2008 - Fan Pages and Sessions

I''m a ruby nuby trying to get through my first Facebooker  
application. I have two issues I need support with.

First is that another user of the application was accessing it find  
and now all of a sudden he gets:

Facebooker::Session::SessionExpired (Session key invalid or no longer  
valid):

How do we go about solving that?

Second is that facebook has an api call for pages.isFan   How can I  
do this call with Facebooker?

Please Help