Create pattern with external image

Hello! How i can fill a movie clip with an external image
my code bellow works only when i import the image and use linkage
with name ‘fonto’. I try also to create a movie clip but when i put it in place of fonto it doesn’t work.

import flash.display.BitmapData;

var jpg:BitmapData = BitmapData.loadBitmap(“fonto”);
function createTiles():Void {

    with (_level0) {
        
   beginBitmapFill(jpg);
         moveTo(0, 0);
lineTo(0, 550);
lineTo(550, 550);
lineTo(550, 0);
lineTo(0, 0);
endFill();

    }

}
createTiles();

This might help:
http://www.senocular.com/flash/source.php?id=0.184

THANK YOU!!!