I need to set up chat on a site in a shared hosting environment. As such, the program must be resource-friendly in a standard Linux setup.

I'm testing the chat script which comes with cPanel. I looked thru the last year of threads here and didn't see any discussion of chat scripts or software...

The chats will be recurring scheduled events where readers can chat with authors, which are a popular feature in the book industry. Need to be able to accomodate say at least 30 chatters, and possibly a lot more if it takes off.

What alternatives do you recommend? I will probably be installing vBulletin later, so its chat would be an option if good.