Quick background help

Hey there, the site I’m developing is currently at http://themagicalmysterytour.net/index.php (not to be confused with the base directory, that’s just a little placeholder index.html while I work on this site)

I’m running into a little problem with one of my wraps that contains the majority of the content area (#mainwrap) it’s quite an odd problem I have actually, as the site renders perfectly in internet explorer, but not firefox (there’s a shocker huh?) edit: To clarify, it’s that the background doesn’t render at all in firefox (neither colour or image)

Here are some links to the validator pages so that you can view the source, CSS, HTML

Many thanks in advance!
-blabj

(ps, for those of you who recognise the design, I’m not stealing, I’m just improving! 😛 )