Anyone please correct me if I'm wrong but I've had a couple of probs with .pngs in IE, especially in AW.

When I upload .png's in here, I get an ugly blue background. So I change the file to a .gif. With the current problem with .jpegs, .gifs are probably the best alternative.

This is what I get for png:

This is gif:

With graphics as small as these, the image quality is barely noticeable. With larger images, you may have to sacrifice quality for the transparent background.