Thumbnail scroller in a MC?

I’ve successfully completed the the thumbnail scolling tutorial and added my own pics with ease.

http://www.kirupa.com/developer/mx2004/thumbnails.htm

However, trying to copy these layers to a movieclip for my flash site is a problem. The images all load up when the previous and next buttons are clicked, but the scroller images will not move.

I suppose I could have all these layers on the main timeline, but it wouldn’t make good structure.

Is there a part of the actionscript i’m not understanding?