Im going nuts! (CSS issues)

Im using a css drop down menu. I’m not done customizing it yet though, but you’ll get the idea. I’ve made it function OK (I think I can figure out the small errors) in Firefox. But it looks waaaay different in IE. Could someone try helping me out? I’ve uploaded the site to:

    [http://www.olssongerthel.se/site/index.html](http://www.olssongerthel.se/site/index.html)
     or in .zip [http://www.olssongerthel.se/site/site.zip](http://www.olssongerthel.se/site/site.zip)

    how it should look(the menu):
    [http://www.olssongerthel.se/nytt/index.html](http://www.olssongerthel.se/nytt/index.html)

    please help me out and check my CSS. I cant find the problem