Resize background image to browser in scale

I am hoping that someone can give me a hand with something.

I am trying to achieve an effect seen as on this website. www.viaduct.com

I want to have a background image that resizes to the browser window (my other elements retaining their size) - but stays in scale. I have been using the code provided at gotoandlearn which tiles the image. Here is the code used there.

import flash.display.BitmapData;

GreyBar._xscale = Stage.width;

var tile:BitmapData = BitmapData.loadBitmap(“tile”);

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

fillBG();

var stageL:Object = new Object();
stageL.onResize = function() {
fillBG();
GreyBar._xscale = Stage.width;
}

Stage.addListener(stageL);

Can anyone take me the rest of the way - or point me to a tutorial that will help me get there?

Thanks