Desi,
To be honest I am not familiar with VBPortal's interface so I can't really help you there; however, I can help you if you want to put such a script on
just the VBindex page.
Firstly you need to find a script. I know Moreover Technologies (moreover.com) use to offer a free version of their news software; however, that was a couple months ago. You should defintely be able to find one somewhere on the web and most likely it will be a mix of simple HTML and javascript.
After you have the code neccesary go to your
forumhome template and place the code where you want it to go. Most likely you would want it after your header. In this case search for this in your
forumhome template:
Then place your code after that on a new line. That should set you up and it should only put the script on the forum home (index page).
If you have anymore questions feel free to ask