Corrupt JPEG images

JPEG images on the main page are not displayed correct (IE 5.5 SP2). For example the picture of the Plextor DVD-ROM in looks like this for me:

The problem seems to be that the url to the pictures doesn’t include .jpg because shows a corrupt picture while shows the correct picture.

Does the Plextor icon (the 70*70 image) show up correctly in that news post? All images, when uploaded, are converted to extension less files. Pictures work fine here though.

Yes all GIF pictures are displayed correct.