+1 for testing. It's a mine field out there.

@Ben You're going to be paying for that when IE8 and IE9 adoption rates increase (or Firefox/Chrome/Safari for that matter), or if any of your users attempt to access the page on a mobile.  Have fun going back and fixing all of that old code.  Target a single browser and you're giving up one of the main benefits of the web.  Good code is future compatible code.