Loaded jpg width gets chopped at 2880px

1

I have an jpg that is 3300 pixels wide (it’s a scrolled panorama of images), and for some reason when I load it into a targetMC, or level, the image cuts off at 2880 px. There must be a way around this like in this example:

http://thehulk.com/modern_evo/index.html

I would greatly appreciate any advice.

thanks,
elstrausso