Professional :: Make A Field Show As "read" When Returning To Menu?

I'm in the midst of creating an extremely rudimentary game show display. It will essentially function like the big screen in Jeopardy.
 
I want to be able to have this operate in four stages. First stage: One frame will have all the question categories and values laid out in a grid. Second stage: I will click on a category and have it link to a frame that displays a question. Third stage: Once my participant answers the question, I will click once more and be linked to a frame that has the answer. Fourth stage: I click a link back to my initial grid of questions, but the category I just went through is now a different colour/blacked out/faded
 
I can do steps 1-3 quite easily, I just don't know how to make step four work. Just to clarify, say all the questions are in blue and I click "History for 200". I want to be able to go through, answer that question, come back to the grid, and have "History for 200" now be in red (or something). This would have to work for multiple questions, as it should show the participants which questions have already been asked.
 
I'm a quick learner and am just looking for the actionscript or whatever that requires this. My question wasn't really short enough for searches of Google and this forum to yield anything.