How to make mouseover scroll buttons attached to textarea with external loaded text?

I am working in Flash CS3 and AS3, and I’m not good in scripting.

I want to make a dynamic textarea with loaded text from an external textfile, and then I want custom made arrow buttons to start scrolling the loaded text on mouseover (not click) andt stop scrolling on mouseout. Ala like in this webpage: [COLOR=#800080][/COLOR]

The part with the loaded text is fine, but I can’t manage to script the arrow buttons to do what I’ve just described. Even though I have searched the Internet for recipes I just find how to scroll loaded text on click or with a scrollbar. This problem is starting to drive me crazy!! Is there anyone that have a recipe for this??