Also see this page for more information on using named anchor links (i.e. page.html#image) to avoid the "first link counts" issue. This is what Alan Mosley is recommending. I think it is much safer than using CSS to try and "trick" search engines. You can put the image on product pages in a named anchor like #image.

Resources:

http://www.seomoz.org/blog/results-of-google-experimentation-only-the-first-anchor-text-counts

http://www.seomoz.org/ugc/3-ways-to-avoid-the-first-link-counts-rule

http://www.seomoz.org/blog/the-first-link-counts-rule-and-the-hash-sign