Need help modifying some html/css.

I want to implement some tabs on a page that I'll be building. At the moment I found the code that I'd need to implement the tabs, but I am unsure how I can go about modifying their theme. The tabs that I've found are located here:

http://www.sohtanaka.com/web-design/simple-tabs-w-css-jquery/

I'd like to know how I could change it to possibly have rounded corners (on the tabs, not the rest of the window), a drop shadow (at the bottom of the box), and possibly change the style of the tabs using images/rollovers instead of the plain single colors that the tabs have now.