How to adapt a tabbed, iframe script originally for html to work within a wordpress page?

I'm not sure that this qualifies as a beginner question, but I previously had set up tabbed iframe into some html pages. I would like to convert the script to work with css in wordpress. I've never worked with CSS, so I am clueless on how to convert html to css. I realize that it isn't a WPMUDev script, but, I'm hoping someone can provide me with the info I need.

An example of the script in action can found at http://www.newsgalleria.com. I picked up the script from dynamicdrive.com. You can find it by searching for "tabbed document viewer".

I downloaded a WP Theme called Appliance, which is a single column page, which I am thinking about using for such pages in my portal project. Any help or advice is appreciated.

Thanks