Have the enlarged images been saved as RGB or CMYK images? If the latter, they should be the former. I'm betting that this is the cause since there is nothing sophisticated going on there - it's just a link to a larger image.
Thumbnails and large images all download and appear OK here in IE. No red X at all.
They do not work for me in IE8 or IE7, but in IE9 it's fine.
I opened a larger image in photoshop and it was indeed CMYK. So as Murry suggested, that's the problem.
Yes, definitely a CMYK problem on the large images.
They appear OK in IE9 here and, curiously, also OK in IE8 Compatibility View.
clicking to an image (here Flat-back-bucket ...) on your website I get this in my IE8:
http://www.alliedprecision.com/images/ag-web/10FB%2010-quart%20Heated%20Flat-back%20Bucket %20outline.jpg (no image and a red cross).
When I use the correct path from your source code:
My proposal: don't use these "-", I fear IE doesnt know to handle it, try to use underscores or dashes.
Dashes will make no difference, Hans. It's a perfectly valid character to use in links. The problem is the color-space of the enlarged images.
Thanks, folks. RGB it is. Can you tell I'm an old-time print guy? Now to make a macro to convert those 450 photos...
In Photoshop when you hit File > Save for Web & other devices, it automatically converts them to RGB mode. This is what you should be using for all your web graphics so you can optimize them (reduce file size).
Use the Actions panel to record your steps with one image.
Use Batch processing to replay that action on an entire folder of images.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
Now to make a macro to convert those 450 photos...
Depending on which version of Photoshop you have, File > Scripts > Image Processor (in PS) will do the job quickly.