Can't see thumbnails, images won't open!

Hey, all of a sudden (about 2 days ago), my browser (Firefox 2) stopped showing the thumbnails for the image/movie links. Images show on all other websites, and I can still right-click above the "titles" and "open in new window" to see the full images, but the thumbs aren't showing up. And when I left-click on them, a new browser window pops up (as before) but there's no image in it. I tried running from another PC, clearing my cache, etc. but no joy. And it's only on this site. Any ideas? (And yes, I'm logged in!) Thx.