[Sh@man]

А вот и для jpg (те же яйца, только в профиль)

MovieClip.prototype.preloadJPG = function(yourImage) {
this.createEmptyMovieClip("imagerTargetMC", 1);
this.createTextField("preloadDisplay", 2, 5, 5, 300, 30);
this.imagerTargetMC.loadMovie(yourImage);
this.onEnterFrame = function() {
this.preloadDisplay.text = this.imagerTargetMC.getBytesLoaded()/1024 + "KB LOADED" +
this.imagerTargetMC.getBytesTotal();
if (this.imagerTargetMC.getBytesLoaded() > 1 && this.imagerTargetMC.getBytesLoaded() >= this.imagerTargetMC.getBytesTotal()) {
this.preloadDisplay.removeTextField();
delete this.onEnterFrame;
this.onComplete();
}
}
};

this.createEmptyMovieClip("loadTarget", 1);
loadTarget.preloadJPG("yourImage.jpg");