adding random movie clips to the stage with AS

Hi,

I need some help with my code.

I have 3 different movie clips.

They are called butterfly00, butterfly01, butterfly02. They are exported for AS.

I need to add them to the stage using AS. Randomly. Using a timer.

I put them into an array and the idea was to pull them out from there, but it doesn't work properly.

At the moment it works correctly for the first 2 butterflies. After that it adds to stage 2 butterflies on the same time and then 3 and 4 and etc. Accumulates.

Maybe someone can comment the code.

Many thanks in advance!

var timerLeft: Timer = new Timer(5000, 10);

var liblikas00: butterfly00;

var liblikas01: butterfly01;

var liblikas02: butterfly02;

//var liblikas: MovieClip;

var symbolArray: Array;

var symbolButterfly: int;

symbolArray = new Array();

1. symbolArray.push(liblikas00);

trace(symbolArray[0]);

1. symbolArray.push(liblikas01);

trace(symbolArray[1]);

1. symbolArray.push(liblikas02);

trace(symbolArray[2]);

1. timerLeft.addEventListener(TimerEvent.TIMER, butterflyToStage);
2. timerLeft.start();

function butterflyToStage(event: TimerEvent): void

{

                symbolButterfly = Math.floor(Math.random() * symbolArray.length);

                trace("symbol is " + symbolButterfly);

                switch(symbolButterfly)

                {

                               case symbolButterfly = 0:

                                               var liblikas00: butterfly00 = new butterfly00();

                                               liblikas00.x = stage.stageWidth / 2;

                                               liblikas00.y = Math.floor(Math.random() * (1 + 350 - 150)) + 150;

                                               stage.addChild(liblikas00);

                                               break;

                               case symbolButterfly = 1:

                                               var liblikas01: butterfly01 = new butterfly01();

                                               liblikas01.x = stage.stageWidth / 2;

                                               liblikas01.y = Math.floor(Math.random() * (1 + 350 - 150)) + 150;

                                               stage.addChild(liblikas01);

                                               break;

                               case symbolButterfly = 2:

                                               var liblikas02: butterfly02 = new butterfly02();

                                               liblikas02.x = stage.stageWidth / 2;

                                               liblikas02.y = Math.floor(Math.random() * (1 + 350 - 150)) + 150;

                                               stage.addChild(liblikas02);

                                               break;

                               default:

                                               trace("nothing");

                                               break;

                }

}