I modified the Twenty Ten theme for my web site and everything looks great on Firefox, but when I look at it on IE, the sidebar isn’t floating correctly. I can’t figure out what I did wrong. I tried resetting the style.css back to the original Twenty Ten but that didn’t seem to fix the problem.

My web site is here:
http://www.sarahwebdesign.com/gonebananas

Here’s the style.css
[CSS moderated as per the Forum Rules.]

I appreciate any help. Let me know if you need any other of my code.