Looking for advice on free chat room code

In my eternal Quest for Interesting Content for my slowly growing web site, I’m considering putting a chat room on it. A quick Google search revealed several sites where you register for free and they send you code to cut and paste into your website.

This looks pretty cool, but knowing little-to-nothing about Java and HTML and such, I’m somewhat hesitant to just copy and paste code that I don’t understand. Have any of Ye Wise and Knowing Dopers used any of this kind of chat room and had any good or bad experiences with it?