Buttons Highlighting

Here is what I am trying to do, I have 5 buttons with numbers 1-5. I have it set that when it starts to slowly goes though all the slide unless clicked on each number button it goes to that frame for that image, But what I would like to do is when the flash plays or when one of the numbers are clicked on that the button will stay highlighted, I have it set when when you move your mouse over it it goes yellow but i would it like it when the flash plays it highlighted what one it is on how to do that.