Scroll on IE7 and IE8

Hi
I use Magic zoom Plus since february this year .
it works very well with most of the navigator. We just have a problem with IE7 and IE8.
We use a scroll and when we scroll down the product page, the image stays at the same place and text scroll under the image.
For example :
http://www.supreme.fr/billard/billard...
Have you an idea where the problem can come from ?
Best regards
Didier