Image pan - vertical

Hello. It’s my first time here, so if I’m in the wrong place please excuse me and tell me where I should be instead…

I’d really like to do this, but vertically:

Can anyone tell me what changes I’d have to make to the code so there would be vertical movement? (Basically, I have an “A4” dimensions image that I’d like viewers to be able to pan up and down through a kind of “letter box” opening.)

The effect is exactly what I want, but the movement must be vertical, not horizontal.

I’m new to (and eager to learn about) Flash. So don’t get too technical with me…