Firefox won't display .png graphics on site... but ie will... ???

[nordrithal]

The site is

http://mcel.pacificu.edu/barlow/courses/2008/spring/h213/

I've been assigned to "correct" this issue, and didn't build the page myself. It's a bizarre problem, though. There should be two pictures in the upper-left corner (you'll see them if you're using IE), but for some reason, they aren't being loaded by Firefox.

And ideas or suggestions? I'd like to get this figured out. I was under the impression that more often it was IE that had issues with .png files, not FF :/

[drhowarddrfine]

Yes, IE has png problems. FF does not. I'm looking at this now.

[drhowarddrfine]

Well, you fixed it before I finished looking at it. Something having to do with the layout of the banner div?