CSS guru needed

Any CSS experts out there? I need a bit of help on a project. It has a header graphic with a transparent gif that moves when the browser is resized. It works fine in FireFox, however the header graphic doesn’t appear in IE. I’m baffled.

You can email me using the link on the left or leave a comment with contact info. Thanks!

Update: Solved it! The differences between browsers in rendering CSS style sheets can make web developers smash their heads against the wall. A page that looks perfect in Firefox might come out mangled in Internet Explorer, the above being a perfect example. The header graphic refused to appear in IE but did in Firefox. A new version of the theme, which I then tweaked, solved it. The theme developer had to put in special code to make IE behave.