Pausing playback & its sound with a button?

I am building a presentation in Flash. Right now the entire presentation plays from start to end. But I need to know how to pause the presentation at will by pressing a button on the stage. Also, I need the sound files (the voice-over work) to pause as well when the ‘button’ is pressed. And of course, to resume playback when pressed again. Can anyone help me out? Thanks!