IE Version: Latest
CSS & HTML:
If It's not works... then there's something wrong with the jpg files, probably. IE8 is not able to render them. Maybe you are using a JPEG2000 format?
Try loading the pictures in an editor, like GIMP or PhotoFiltre and re-saving them (using save as).
You should try to make image files as small as possible on the site because that largely affects the visitors experience.