main menu align won't align correctly in ie6.

Hello, thanks for your great theme, I really appreciate your hard work!
I'm now using zeropoint 7.x-1.1 in my site, it works great in ie7+ and firefox, but refuse to align the main menu correctly in ie6. Is this a bug or do I have some parameters set wrong?I attached my screenshot and my site url is www.mangshiba.com.

I would be grateful if you give some hint to solve this problem.^_^