How to make this for as3

1

var depthLevel = 3000;
var boxCounter = 1;
var curr_box;
dropTimer = setInterval(createBox, 1000);

function createBox()
{
curr_box = cloudLayer.attachMovie(“box”, “” + boxCounter, depthLevel);
curr_box._x = 800;
curr_box._y = Math.random() * 420;
curr_box._xscale = curr_box._yscale = 90;
curr_box.speed = 15;
boxCounter += 1;
depthLevel += 1;
curr_box.onEnterFrame = boxMove;
}
function boxMove()
{
this._x -= this.speed;
}