Controlling the number of MC instances

Hi!
I created this code to attach a MovieClip to the same position as the mouse.
This works, but I don’t want to attach more than tree MC at the same time.

Shouldn’t this line be enough?

for (var i = 0; i<numbBombs; i++) {

var stageWidth:Number = Stage.width;
var stageHeight:Number = Stage.height;
var numbBombs:Number = 3;
var gravity:Number = 5;
var movieBomb:MovieClip;
//
_root.onEnterFrame = function() {
for (var i = 0; i<numbBombs; i++) {
movieBomb = _root.attachMovie(“bomb”, “bomb”+i, _root.getNextHighestDepth());
movieBomb._x = _xmouse;
movieBomb._y = _ymouse;
movieBomb.onEnterFrame = falling;
}
};
//
function falling() {
this._y += gravity;
if (this._y>stageHeight+10) {
delete this.onEnterFrame;
}
}