Static product images Vs Rollovers.

Neither.

C) a single large image with a row of thumbs that enlarge into the larger display area when clicked..

- arbitrary mouse movements may trigger image display. I expect action when I click, not when moving the mouse.

- There may be a delay while the next image loads. I expect a slight delay when clicking, and it may take several minutes before I realize my mouse movement is loading images.

- with a click you can do this

<a href="image.jpg" onclick="return load_into_frame(this.href);">

where load_into_frame is the function that loads the image into the larger area. This is a)easier to code, no hard coded image references, and b) if I decide Javascript is being abused on the site I can turn it off and still access the images.

However, if the question is scroll versus reduce scrolling, I vote no scrolling, or as little as possible.

amazon actually use what I mentioned regarding the rollover thumbnails.

I expect one medium sized picture which I can enlarge with one click.