Moved javascript files into their own directories to keep things cleaner.
Added jQuery fallback (if google's CDN version doesn't load for some reason) that is taken almost verbatim from the HTML5Boilerplate project
Moved javascript code relating to the menu into javascript file which is more sensible place for it.
Fixed unnecessary wrapping of jquery object that effectively did $( $(this) )
Moved no_javascript CSS class onto HTML element and renamed to no-js so that this technique (for detecting javascript) can be used elsewhere.
Top and bottom bar now share border radius.
A CSS class is now added the HTML tag that is dependent on IE version. This is inspired by HTML5Boiler plate.

This allowed a minor fix to be applied for IE9 so that now selected tabs have rounded corners.
Moved ie7 hacks into style.css to keep all the CSS in one file.
Added a special javascript hack for IE7 (and for IE6 but it's not been tested)
that effectively means that menu elements in the bottom bar (blue bar) are corrected centred.