Auto Login Script

I am running a PHP flash arcade site with IPB board 2.3.x user A is logged into [login to view URL] as Eric. Eric clicks a link on some-site.com. A new window opens directing Eric to another-site.com. Eric is automatically logged into [login to view URL] as Eric (s-s) <<-- initials of the site that Eric came from and will be stored in the sql database as so. Eric would also be put into the [login to view URL] group. I am basically linking multiple websites to my website to all battle in 1 arcade site together while each sites members represent their own home site. each domain will be a different domain and server. I will only own 1 of the domains that are linked in this way. I hope I have been clear. If there are any questions please feel free to ask and I will explain. ## Deliverables On top of what was said before. The script will need to be commented out fully enough to be easily edited for each new web site that is linked to me. each auto logged in user from another site will have a generic password encrypted in md5 hash stored on my server for security purposes (open to suggestions). This must be a solid script. the owners of the sites to be linked to me will be open to having some small amount of script installed onto them in order for this to function properly. Which I will want to know how to install. I hope I have been clear enough. Again, contact me if there are any questions through email. YIM - yahoo_futures, AOL - Yahoo Futures, or MSN yahoo_login@hotmail.com. Thank you