Draggable Menu, HELP!

Hi,

I created a draggable menu, following tutorial from ilyaslamasse ( Draggable Menu 2.0 – Part II: Usability).
http://www.kirupa.com/developer/flash5/menudragger2.htm

It works well, but I have another idea:

Would it be possible, if the numbers (1, 2, 3, 4) can be fit into the viewing box precisely, without showing the background when we drag the numbers to far left/ right?

At the moment, the animation (draggable 1, 2, 3, 4) has same background colour, black (for both viewing window and the background behind the viewing window).

The animation I created, the viewing window and the background have different colours. White for the viewing window and grey for the background, hence we can see the white bit when dragging the picture to far left/ right.

Attached is the .fla file of my work. Perhaps, anybody can help me?

Thank you very much guys,

m4non