I would be grateful for any help in producing a semi transparent background for a pop up menu. I have seen the effect at the VW website --here: http://www.volkswagen.de/home/index_.htm

The gif background I have created is not as smooth as the VW one, to see what I mean see my cloned test site at the following address --http://www.medics.demon.co.uk/

Any help would be greatly appreciated