stage.addEventListener(MouseEvent.MOUSE_DOWN,makeObj);
function makeObj(e:MouseEvent):void {
var obj_mc:Obj=new Obj();
obj_mc.x=e.stageX;
obj_mc.y=e.stageY;
var scale:Number=0.8+3*Math.random();
obj_mc.scaleX=obj_mc.scaleY=scale;
addChild(obj_mc);
}