Last year the standard browser at my office was IE7, so we designed all or our pages to render properly in that, the current FF of the time, and any other browser we could get our hands on. This spring, we got pushed to IE8, and sometime after that, we made some CSS changes to our site that has produced unexpected behavior in IE7. We didn't realize it was happening until one of our developers viewed a page in IE8 set to IE7 mode.

What's happening is that our navigation tabs are moving to the right, and causing a horizontal scroll bar to appear.

Here's one of the pages in question: link and here's another one: link

Any ideas as to what's pushing our menu to the right like that?