loading undefined

[pasavign]

Nel 1° frame...

stop();
var bylo:Number  = this.getBytesLoaded();
var byto:Number  = this.getBytesTotal();
var pctLoaded:Number = 0;
this.onEnterFrame = function() {
             pctLoaded = Math.round(bylo/byto*100);
             my_txt.text = 'I am loading '+pctLoaded +'% '; 
	if (bylo >= byto) {
			delete this.onEnterFrame;
			play();
	} else {
			bylo = this.getBytesLoaded();
			byto = this.getBytesTotal();
	}
}