Javascript image rollover causes IE 6 to crash!, any ideas? >>

Hi

With a combination of CSS of Javascript I've created an image that when you rollover it causes a <div> with a positive z-index containing a zoomed image to appear. It works fine in Firefox and IE7 but in IE6 on XP something really weird happens...

When you rollover it works ok but do it too fast or too many times it crashes the entire browser with the following message:

"Runtime Error!

Program: C:|Progran Files|Internet Explorer\IEXPLORE.EXE

R6025
-pure virtual function call"

Here's a screenshot of it:

http://img230.imageshack.us/img230/7...screenshot.jpg

You guys got any idea what it could be?

Thanks :)