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I suggest you take a look at iJab. iJab is opensource and it's based on XMPP protocol. iJab has a facebook style web chat bar and I think sb could try to integrate it into XOOPS.
http://www.ijab.im
http://code.google.com/p/ijab/
http://www.ijab.im
http://code.google.com/p/ijab/
