TweenMax - startAt loop and yoyo function

import gs.TweenMax;

var total:uint=30;
init();
function init()
{
 for (var i=0; i<total; i++)
 {
  createBall(i);
 }
}

function createBall(mc)
{
 mc = new Shape();
 var radius:Number=Math.random()*50+10;
 with (mc)
 {
  graphics.beginFill(Math.random()*0xFFFFFF);
  graphics.lineStyle(10, 0xFFFFFF);
  graphics.drawCircle(radius, radius, radius);
  graphics.endFill();
 }
 addChild(mc);
 var startpointX:Number=Math.random()*700;
 var startpointY:Number=500-radius*2;
 var topointY:Number=Math.random()*500-radius*4;
 TweenMax.to(mc,1,{y:topointY,startAt:{x:startpointX,y:startpointY}, yoyo:true,loop:0});
}

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