Friendly user scrolling text

Hi, I created a scrolling text box loading an external file, and I added 2 buttons with this code:

on (release) {
padri.scroll += 1;
}

on (release) {
padri.scroll -= 1;
}

The problem with this code is that you have to click a lot to see the text, because it goes line by line.

Does anybody knows how to edit this code to make it easier for user to scroll down and up?

you can see an exmple of this problem at this url:
http://www.sabevadistribution.com/film-distribution-company/film-movies-distribution.htm

when you click on a poster and then on synopsis or credits for example .

Thanks a lot.

Zianne