I want to ask how i can, IF i can when add new information in my site categories my members see that with a little sign on a category with new information or a little "new" behind a category with new Subject. And when go inside the little sign go away.

For example:
see the fotos

Added (2010-12-08, 12:13 PM)
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The foto 6546112.gif is without new Subject and the 7437630.gif is WITH new Subject