CSS: Fixed?

Sometimes I hate CSS.  Mostly, I hate Internet Explorer, but I can sometimes deal with it.  I apologize to those who use IE, for you need a better browser and my stylesheet somehow messed up between me checking it on my computer (in IE, even) and getting some comments today.  I don't remember making any style changes since my last test, but anything is possible.

For some reason, I couldn't get the header back to normal, so I just made it 100% instead of having side borders and margins.  I think I can deal.

My trick for getting the angled border is really cheap, and only IE users will notice the orange border splitting the main section and the sidebar at certain resolutions, depending on the site's content.  Deal with it.  I already admitted that Safari doesn't get the borders of the <li> element right, so you can sacrifice something as well.