Posted by Jamie Meyers on 06/03/05 17:18

I actually had a problem with logging into both my sites when I was
developing my open source CMS (ProtonCMS http://protoncms.gotdns.com). Here
is what I did to stop it, and I'll show you how allow it also.

on every page put (in your case header.php).

<other session stuff here>
session_name(SITE_SESS_NAME);
session_start();

If SITE_SESS_NAME is different, then you cannot go across domains that are
on one machine, however if they are the same, then it works like a charm. I
hope this helps.

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