Hi Gail,
I see a script that's operating to do a preload and resize of the images. I'm not familiar with that codeset, so I'd have to break it down to see if it's incorrect (the cause) of the resize problem. My guess is Yes, or you wouldn't have a problem with the first image.
Generally, I use the javascript onload event for the image and a test to assure the image is actually in the cache (completes the store which isn't always true/delayed with onload event) before I resize. My advanced loader also operates reentrant with prototype methodolgy. Images load asynchronous to call and that might be part of the problem, although a SetTimeout appears to be used as a delay and retest method.
If you absolutely need to resize, I can check your code when I get some time.
Danno