Load External SWF files into a Movie Clip

programming flash
1

I can load an external SWF into another movie like so:

var loadRequest:URLRequest = new URLRequest("content.swf");
var swfLoader:Loader = new Loader();
swfLoader.load(loadRequest);
addChild(swfLoader);
swfLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
function onComplete(event:Event):void {
    trace("swf loaded");
}

I have a Movie Clip called load_mc. How can I get the content.swf to load into that location?