Yes, use less images, but use PNG's!
An explaination of why this happens is
here. Basically, Photoshop adds some gamma garbage which IE renders.
You can use pngcrush to remove the extra gamma information. (it lowers file size too!) Unfortunatly though pngcrush can only be used by command line, if you can't handle that you can download
this nifty program instead which does it for you. Just browse, select, done!