Problems with satying logged in

I have a website that was created with flash 8 AS 2.0 [URL=“http://www.thelitonagency.com”]www.thelitonagency.com we want user to register to be able to view some of the pages like pictures and such. it all works fine but i don’t know how to keep them logged in in the session. When they leave the page they they logged in to and try to go back to it it asked them to log in again. I don’t want them to do that i want the action script to keep the session logged in. If anyone can help that would be great. :-/