IE9 menu problem

Whilst surfing the website I noticed that there is a small overlay problem on their homepage when viewed in IE9 .

As you can see from the below screen grab the “Contact Us” Tab field shifts onto the second layer nav panel.

How can I fix that?

Different browsers calculate pixels differently. If you reduce the left-right padding on the links a bit, they will all fit on one line. However, if someone has their font size bumped up a bit, you’ll find those links start to drop anyhow … so trying to get them to fit in a tight space like that isn’t a good idea.

The obvious problem with reducing the padding is that the links don’t look evenly distributed. There is a nice way around this, consisting of unfloating the last LI and adding overflow: hidden, as mentioned here: