Resize MovieClip Loader AS3

I am trying to open up external (swf's and jpg's) within a flash window once I press a button. I have created a loader and open the file within a MovieClip. The problem is... It does not scale the external swf or image to the size of my movieclip. How can I force the loader to resize no matter what I open to a set size? I have tried using "loader.width=300;" but once I use that, my external .swf does not show at all in my movieclip. Here is my code that I am using to open the file using the loader. I am using ActionScript 3.0Start Free Trial

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player.addEventListener(
MouseEvent.MOUSE_UP,
function(evt:MouseEvent):void {
    var loader:Loader = new Loader();
    loader.load(new URLRequest("movie.swf"));
    movie.addChild(loader);
}
);