Help for balloon popping test

I found some code for a popping balloon.

It has one balloon on the stage with instance name “baloon” and the code in the action frame is this:

onMouseDown= function () {
if (balloon.hitTest(mx, my)) {;

I want to add more balloons to the stage. When i do - how do i change the actionscript to accommodate the extra balloons? I assume i need to give them each unique instance names too?