Overlapping rain...

Hi I am very new to this and keep getting the problem of the raindrops in my movie overlaps every time the clip loops, and after about 5 loops/plays the rain clutters the stage and

performance/everything is slowing down. How do I restart the rain array animation for every replay? I hope someone can help me in this matter, because I have a client waiting for me to resolve this... To make myself clear: What I need is the rain to be constant, and not add more and more rain as the replays go on.

Here is the code, it is from the Rain-template in Cs6.

// Number of symbols to add.

const NUM_SYMBOLS:uint = 175;

var symbolsArray:Array = [];

var idx:uint;

var drop:Rain;

for (idx = 0; idx < NUM_SYMBOLS; idx++) {

    drop = new Rain();

    addChild(drop);

    symbolsArray.push(drop);

    // Call randomInterval() after 0 to a given ms.

    setTimeout(randomInterval, int(Math.random() * 1000), drop);

}

function randomInterval(target:Rain):void {

    // Set the current Rain instance's x and y property

          target.x = Math.random()* 550-50;

    target.y = -Math.random() * 200;

          //randomly scale the x and y

          var ranScale:Number = Math.random() * 3;

          target.scaleX = ranScale;

           target.scaleY = ranScale;

          var tween:String;

          // ranScale is between 0.0 and 1.0

          if (ranScale < 1) {

                    tween = "slow";

          // ranScale is between 1.0 and 2.0

          } else if (ranScale < 2) {

                    tween = "medium";

          // ranScale is between 2.0 and 3.0

          } else  {

                    tween = "fast";

          }

    //assign tween nested in myClip

          myClip[tween].addTarget(target);

Hoping for some solution to keep it nice and constant played as a flashbanner ad.

Kris