Форуми / Cotonti / Extensions / New Chat plugin ! (have a go at the demo)

It has separate tpl's and css (small), so you can do with it what you want :P.

I am finishing this plugin.
What it still needs is an aliasname input box when you are a guest...

I also want to include a #online users item, so that you can see if
there are users there to chat with