Problem with Menu and IE 8!!

Hi,

if you move your mouse over the menu, the "mod_gk_image_show " moves down (see img). After a few seconds, it pushes itself back up. This problem is only with IE8. In Firefox, the problem does not. You can see this on your demo on http://demo.gavick.com/joomla15/apr2010/

Any solution?

Holger

any idea? Is this normal?