CSS - Complete Duffer Needs Some Help - Please!

I'm sure this is a ridiculously simple question, but hope someone will help anyway. I keep a "current news" box on the right-hand side of my page (rishton.info). The box is present on all pages in the site and links to the appropriate pages giving fuller information about the news items. At the moment I've simply turned the news into a single graphic, linked by means of mapping - but this is a ridiculous way of doing it, not least because to change the news links means going through every page on the site (which means in practice that I never change my "news"). What I'd like to do is of course to have something (preferably text-based rather than a graphic) that I could change using the css. Is there a way to write text into the "news" box directly from the style sheet, or is there some other sensible way to do this?

Thanks for your help!

Tim