The images are hosted on a different web site. That web site has "hot linking" disabled.
The images are showing up sporadicaly because after you have looked at web pages on the same web site, the web browser keeps the images in memory for a short period of time. When you then visit a different web site that links to the same images, it just pulls them from memory.
If the web browser had to hit the web site every time it needed the image, the images would always be missing when looking at the DreamBook site.
So one solution would be to add http://books.dreambook.com/lynlos to the list of URLs that can hotlink to http://www.sinisefans.org/icon/
See Preventing hotlinking
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