Scrolling Text Box

Hello everyone. First off, I am not a coder or web wizard. I am working on
this site:

www.ingenieursonline.co.uk

I created the scrolling text box to fill that white space, all was working
fine until two days ago when it decided to shrink. My hosting company says
they have done nothing, which I believe as quite frankly why would they! I'm
guessing it's an incompatibility with some browsers?

Basically, I need to have sections with text which can scroll if I add a load
of text. In Dreamweaver CS3 which is the best way to do tis, for a very new to
web design chap?

Take care.

A.