If you use solid gifs, the format is quite simple. The colors are simple hex-pairs, and so can be manipulated on the fly. One site I worked on years ago, we altered and served the gifs on the fly to make a rounded corner match the user's color scheme. I was quite proud of that little trick.
With ASP.NET, there is the System.Drawing namespace, which allows you to create bitmaps dynamically, on the fly, and and them to the response stream.
All of that is just "FYI", as your question has already been answered: rounded corners are graphics, not CSS (yet).
If the idea is just visual appeal, consider floating text around a graphic...
http://www.bigbaer.com/css_tutorials...p.tutorial.htm
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Made Her Cry
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since Dec 2004