Navigation bar doesn't appear in Safari...

Question for everyone, as I don’t have a safari based system here to trouble shoot this monster :-( on my site http://ohmygods.co.uk the only CSS not showing up properly in safari (to my knowledge) is the #navigation bar near the top—in safari (apparently) nothing shows up there. ANNOYING! If anyone could help and give me some hints on how to fix this problem that’d mondo rock, thanks!