Preloading tiled background

1

I’m trying to complete tutorials on gotoandlearn.com but the fullbrowser backgrounds and the preloader clash. The instructions say to import the tiled graphic on the first frame but that obviously takes a while to load and cancels out the preloader. Unfortunately I can’t just plunk the background into a layer. Is there a action script that will load the graphic without placing it on stage? I assume you can use attachMovie but that seems clunky. Any suggestions?

import flash.display.BitmapData;
container._x = Stage.width/2;
container._y = Stage.height/2;
var tile:BitmapData = BitmapData.loadBitmap("tile");

function fillBG() {
    this.beginBitmapFill(tile);
    this.moveTo(0,0);
    this.lineTo(Stage.width,0);
    this.lineTo(Stage.width,685);
    this.lineTo(0,685);
    this.lineTo(0,0);
    this.endFill();
}

fillBG();