Как-то так:

Код:
var current:Number = 0;
var clipLoader:MovieClipLoader = new MovieClipLoader();
onLoadInit = function(mc:MovieClip){
current ++;
loadImage();
}
clipLoader.addListener(this);
function loadImage():Void{
var url:String = 'img' + current + '.jpg';
var container:MovieClip = _root.createEmptyMovieClip('img' + current, _root.getNextHighestDepth());
clipLoader.loadClip(url, container);
}
loadImage();