An xml quickie

Hi Guys =)

Small question - does anyone know why some of my jpegs are banding?
If you go to urbanscapes > #3, you’ll see what I mean.

www.ursbuhlman.com/new/home.swf

Any help would be greatly appreciated!

Things I’ve tried are:
1/ resaving as a maximum-quality jpeg
2/ saving in bmp, png formats
3/ looking through the code for anything that compresses images
4/ exported entire movie with images uncompressed
5/ checking the dpi of the image (it’s currently at 72)
6/ the original jpg image files are fine. see www.ursbuhlman.com/new/URB03.jpg

{thanks in advance for your time.}