Flash 8: How to lock button over state?

I am looking to lock the over state of a button on a specific frame I have labeled. In other words, I only want the over state to lock on that specfic frame but behave normally on all other frames. Is there a way to do this with actionscript? If so could someone provide some code that would work? If not, what is the most efficient way to do what I need to do? It would be much appreciated, thanks.:puzzled: