If you wanted the two different websites chat's to be merged, the best route to go would be using an ajax IRC library, or plugin. It would be quite an undertaking to do it otherwise.
If the sites admins are interested in this, I could offer some advice, and/or do some research for them. Just send me a PM.
"We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know." - Albert Einstein
"When will our consciences grow so tender that we will act to prevent human misery rather than avenge it?"