Javascript to stop animated GIFs?

I'm working with a complete rebuild of the HBS Videotools online video content management system. We're using keyframes pulled from Virage logging of the video to build an animated gif that cycles through a few video frames -- this appears in search results and on video details pages. The problem is that if you have a lot of these in your results, the page can be a bit "overactive" to view comfortably.

So....what I'm looking for is a way to let the user stop the animations at will. Pressing the Escape key does it. Programmatically I can do it with Javascript by issuing a window.stop() command, but that only works on Netscape/Mozilla/Firefox based browsers. Is there a way to accomplish the same thing for IE users? Email me if you have a solution - I'll post again if I find anything that works.