Yeah, that looks like the very first AGI interpreter written in Javascript. Sarien.net was the second such interpreter but is obviously the more advanced one these days. The one you've linked to was written in 2006 I think, and sarien.net was around 2008. Incidentally, I know of a third AGI interpreter written in Javascript that is being worked on at present but I have no idea what the status is. It hasn't been released.