I think this has something to do with bugs in MSIE's "box model" for laying out web pages. I'm guessing the navigation tabs are beyond the right edge of the page.
It's odd that no one else has reported it -- but, on the other hand, who would notice something that isn't there? You'd have to look at the page in both browsers, otherwise you'd never know anything was missing. So maybe you're the first person to have done this.
BTW, the layout on my Firefox is different still. The "Helping You Live..." tagline is too big to fit in the black space to the right of the logo, so it ends up below (white on white), with the four navigation tabs underneath.
Looks like Jack is gone for the weekend. I don't know if it's Jack or SW who's responsible for that page, but I'll bring it to her attention (because I think she's been spending too much time lounging around doing nothing

).