i guess popup frenzy will be problematic, but it's the only way i could come up with to enable using the same chat window in multiple sites.

thanks for comments about registration. I have the idea of allowing users to discriminate by nicknames. By Openid and Oauth users are already using the same id's on many websites, so i believe it would be ideal to use same ids on visitrs, for it's aim is to connect the websites community online in almost realtime. But maybe i'm wrong :)

thanks