how do i make a scrolling text box?

hi, i'm looking to make a text box that the user can control the scrolling, i've made it how i want it to look already, but i haven't got a clue where to start as to how to make it actually work.

here's how i've got it set up so far, okay this is gonna take some explaining:

i've got the document made up in AS2, the movieclip known as 'Philosophy_tween' is on the main timeline, and inside that movieclip are two more child movieclips, one for the text and another for the scrollbar.

the text movieclip is set to scroll upwards, behind a masking layer using a motion tween on the parent movieclip, whereas the scrollbar movieclip motion tweens (inside itself) the scroller button. look at the attached image.

both motion tweens have a stop(); script at the beggining.

i don't know what to do after this though, so please help, thanks in advance!