Flash Custom'd Scrolling Textbox

Hey’a dudes :D!

Just need a big hand from ya all.
What I’m tryin 2 do in Flash MX 2004 is create a Dynamic Textbox that scrolls. However I want the scroller to be on the left hand side and to be made up of my own custom graphic.

All I need is for the user to be able to drag and pull the ‘scroller’ up and down.

Heres a short animation of what I wuld like.

Basically they pull the green arrow up and down to scroll through the text. The arrow cannot go up past the text vanishing point neither below it.