php redirect problem

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

hi i have several sites which have one session among them in database.
so in every site they have redirection to the main site to get the
session info. But as the redirection is to another page spiders can
see the content i guess.
Because html validator says:

 I got the following unexpected response when trying to retrieve

    302 Found
also some other site says:
Unable to view website. Please re-check address.

The main page redirects to the real site after it creates the session
but spiders cant follow those 2 redirections.
How can i fix it? Does anyone use one session for multiple sites and
handled this problem. Thanks for your help.

Site Timeline