links and all

Hi all!

I'm sure this is a pretty easy question to answer.. once you know it.. but it's been bugging me for a while now.

I use a style sheet for my links, so I can give them different colors for a different status. Let's say the normal status is white, the hover status is green and the visited status is black.

Now I want some links to still appear as white even after they have been visited, and also that when I hover my mouse over it, the link will become green again. Any idea how I do this? Is there some way to "reset" the link to not-visited?