At least I think this is why. When I looked at the source code for your post I found the reference to the image listed as "http://www.CollectionLibrary.com\AllanMcCurdy\scans\cl21478.jpg". I am running a Linux system using Firefox and Konqueror as browsers and I think they do not convert the "\" into "/" and so they do not find the images. I suspect that MS Windows machines using IE do not have a problem with this. When I pasted the URL into the browser and changed the "\" to "/" the image comes up just fine.
Chas