Preloading multiple external images

I am loading two external images into blank movie clips. How should my preloader look like, to wait for these images to load before starting the animation?

Frame1:

Code:

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loadMovie("photo.jpg", photo.empty);
loadMovie("photo2.jpg", photo2.empty2);

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Frame2:

Code:

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var amountLoaded:Number = _root.getBytesLoaded()/(_root.getBytesTotal());
preloader._width = amountLoaded * 117;

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Frame3:

Code:

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if(_root.getBytesLoaded() == _root.getBytesTotal()) {
        gotoAndPlay(4);
}else {
        gotoAndPlay(2);
}

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