Scrolling Nav

*probably a Actionscript Issue

Flash MX project zipped here http://www.si-la.org/timeline.zip (1 mg)
Viewable here http://www.museumoftheamericanwest....asada/home.html

I've created a scrolling timeline of dates from 1807 to 2003 for an exhibition, however the length of scrolling doesn't expand to the end and then repeat seamlessly as I'd like. I've tried going all the way back to working versions (when I had less dates) but it's just gotten away from me - Thanks in advance for any suggestions you can provide.

Best,

BaileyBoy