I really added the information because the thread is useful to others trying to do the same thing. I did know your site was a fixed style.
With modern browsers, translucent themes are being used, it gets tricky when you add IE8, IE7 in the mix. Thankfully the whole lot of them is going away. Companies are the worst, they hang on to these old browsers due to their intranets being geared to them.
I really, really hate supporting IE... I really do.