SWF Compatibility issues with CSS in IE

Hi I’m having trouble with a flash movie inside of IE in a page that uses a fair bit of CSS. I posted this into the Client Side forum on here and was advised to ask in the flash forum.

The page (and site) is http://www.bobvideo.co.uk/os/gsc/index.html

I have tried it within firefox and don’t get this problem but within IE it is pretty annoying. The problem itself is that when you roll over any of the text links (that use CSS) the Flash movie lags. Is this a common problem and is there anyway around this other than having to use firefox?

Thanks