I managed to find a compatible shoutbox script for this Vbulletin Installation which uses AJAX. I tried, installed it and it seems to work =p.
The Shoutbox is only visible to:Users with 1 Post, Elder Users, Coders, Premium Members, Moderators, Global Moderators and ofcourse Administrators.
The shoutbox is currently located on the Portal-Homepage on the top, but I am thinking of relocating it a bit down. However if you are a chat-freak, use this url and you will be lead to a full-page shoutbox which is handier.
So far enjoy and have fun.