Dynamically Loading mp3's

I’ve just used this code to dynamically load an mp3.

//put this on the first frame
mySound = new Sound();

//then attached this to a button
on (release) {
mySound.loadSound(“http://www.antoniomusic.com/audio/MusicIsBorn.mp3”,true);
}

I’d like to make another button that makes the sound stop. I’m lost as to how to do this. Any ideas?

TIA
Amelia