Playing a Sound using action script

Can anyone help?..

I have just completed the playing a sound using AS tutorial:

on (release) {
kirupaSound = new Sound(this);
kirupaSound.attachSound(“coolsound”);
kirupaSound.start(0, 99);
}

i would like to add another button to the movie to stop the sound, I have tried replacing the start with stop but knew it wouldn’t be that simple. Can anyone assist or let me know if there is a better method?

Many thanks