How to prevent a Button from playing a Sound overlaped?

Question

I have a Button named "Bt1P" that when I click on it, the Sound "S1.mp3" begin to play.
This is the code:
Bt1P.addEventListener (MouseEvent.MOUSE_DOWN, Bt1PDown);
function Bt1PDown (event:MouseEvent):void {
clicked = 1;
  var str:String = "S1.mp3";
    var ClassRef:Class = Class(getDefinitionByName(str));
  var playSound:* = new ClassRef();
  playSound.play();       
My question is, what is the right code to tell this Button not to repeatedly play "S1.mp3" while it is already Playing!
because when i click it for the 2nd and 3rd time, the file overlaped, and 3 same sounds play together at once....you know what I mean?
any Help please??....thanks a lot.

Answer 1

Hey Pouradam! How are you!!
I found the answer myself....I just need to Add the RED code as below :
Bt1P.addEventListener (MouseEvent.MOUSE_DOWN, Bt1PDown);
function Bt1PDown (event:MouseEvent):void {
  clicked = 1;  
  SoundMixer.stopAll();
  var str:String = "S1.mp3";
  var ClassRef:Class = Class(getDefinitionByName(str));
  var playSound:* = new ClassRef();
  playSound.play();       
Hope it solved my problem??  Yes It did!