getBytesTotal returns 0

1

This is really doing my nut, i’m preloading an external jpg into a movie on my stage, with a preloader on the main stage rather than the loaded movie, but it always return 0 to getBytesTotal(). Here’s the code:

_root.createEmptyMovieClip('holder', 2);
holder.loadMovie("img1.jpg");
holder._x = 50;
holder._y = 50;
	var l = holder.getBytesLoaded();
	var t = holder.getBytesTotal();
	if (l<t) {
		this.texttotal.text = Math.round(t/1000)+'kb total';
		gotoAndPlay (1);
	} else {
		// fully loaded
		this.texttotal.text = "loaded";
		//this._visible = false;
	}