When you do a search on Google Image search and click on a result, Google shows you the image in a larger view with more details. You can then click through to the image to see more. But many webmasters do not like that Google shows the image in a frame on their site, they want the traffic. So they deploy code to bust the frame and take you to their site.
Google has disabled many framebuster scripts so that the searcher stays on Google's search results preview page.
Levo in the forums said, "Well, apparently Google Image started iframing using "sandbox" - an HTML5 attribute, which disables scripts on the page." So it works on some browsers, not all.
You can learn more about the sandbox attribute and how it works.
Have you seen this?
Forum discussion at WebmasterWorld.