One of the better chat interfaces I've ever seen for a webpage was the system used by
www.theglobe.com Their system allows those who can, to use autoscroll java chat, where posts constantly scroll upwards, those who can't, to use frames which automatically refreshes after a set period of time, and those who STILL can't, to use regular noframes html, and hit refresh.
ALL of which were in the same chatroom, regardless of interface. I was pretty impressed with that personally, although how they coded it is totally beyond me.
Still, worth taking a look at, if you want ideas..
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