[F8] adding to sound to button

[mr_duck]

I have button that is a movieclip, it's a button that rolls in when you hover over it and rolls out when you click off it. How do I add a sound effect to the button.

stop(); 
											 
this.onEnterFrame = function(){
	if(rewind == true){   
		prevFrame();       
	}
}

this.onRollOver = function(){
	rewind = false; 
	play();    
}

this.onRollOut = function(){
	rewind = true;    
}

this.onRelease = function(){
	
}