When I browse my site (www.bespoke-group.co.uk), and having scrolled down a page, sometimes a white horizontal line or two appears across the full width of my header image when I've scrolled back up. As soon as I place my cursor within the boundary of the image, the lines disappear.

I'm using IE8.

Any ideas?

I don't know if this is causing it by I would apply the bug fixes as listed in the New Versions and updating forum. Especially the sub-menu fix.