ie doesn’t do left margin?

hello,
i recently switched over to wordpress and almost finished my new template, which looks ok in firefox.

but internet explorer is centering the content, although i want it to do a margin left 80px.

can you maybe help me out?
i just don’t get it 🙁

the url:
http://spiegelkind.net/content/fuck/

thanks in advance for any help!