Visitor Chat Software

Im looking for some goog/nulled visitor chat software for my site.

I need it to be able to request a chat with the visitor, as well as a standard live-chat button on my site.

Does anyone know of anythign suitable....been searching downloads but can find nothing!

livezilla is free open source, and you have also stats about the visitor similar to google analitics.

Or also the free version of woopra is good too, I think is limited to 30000 page views per month, and include stats and chat.