Another suggestion following up on dragonchild's: try displaying the image another way, just for kicks, like just by copying the url for the image and pasting it into the location bar. Does that work? If so, it is a problem with the html and Netscape 4.*, if not, perhaps the image is subtlely flawed/corrupted, and IE's renderer is better at handling it.

Scott
Project coordinator of the Generic Model Organism Database Project