POST & REFERER problem

I need some guidance on the following problem. I have a setup where the usage flow is (kinda) like this: Page A ----\ /----\ | ---- Login -+-- [done login] Page B ----/ | \ \ (back to calling page) / -------------------------------- Nice ascii art, heh? Description: I have a working session / authorization system which i want to add a feature to. A user who (either from page A or B) wants to login. The user (if not logged in allready) gets presented a loginscreen (login). To login the user POST the login & pwd to the login page (to itself) for validation. If the login is successful i want to present the user with a link back to the initial page (A or B). How can i do this? All i get from $HTTP_REFERER after the login page is - the login page. I know that i must save the reference as the login page gets called the first time, but i haven't managed to get something to work yet. Any helpful soul out there? -- Michel Laine