template menu little crooked, any suggestions????

[m1gu3]

customized my template fron cz_net, made a couple of mods on the menu nothing big. But it seems a little crooked just on firefox. safari, opera even the little browser on cssedit displays it fine.

any suggestions what might couse this error thx in advance for your help.

also here is an image of the actual menu so you can see how it looks like.