Vertical pan btn controlled

Hi Team,

I am trying to make a background scroll vertically. The scrolling should be controlled by three buttons. Top, middle, and bottom, also with some easing. I have been trying to make it work with tweens but it seems to complicated. I looked at the following tutorial

http://www.kirupa.com/developer/flash8/interactive_image_pan.htm

and have been trying to modify it but with no luck. Does anyone know where I can find a tutorial for doing this please let me know. If you don’t know what I am talking about, here is an example of what I am trying to create:

http://www.buscarov.com/

Thank you

BonWhis