How to change stacking of Buttons (or how to change play to pause button)?

My problem is I want to have one button for play and pause music playing in Flash.

Music starts automaticaly, so Pause button is visible. When user presses Pause button, I want to show him Play button on the top of Pause button.

Shortly: Music is playing = visible Pause button
Music is paused = visible Play button

Is anywhere tutorial or explanation.

THX very much for hints :wink:

Jan

Hereโ€™s a FLA file I got off of the forum awhile ago, it might give you some ideas.