Для примера.

Код:
var my_mc:MovieClip = _root.createEmptyMovieClip('mc0',1);
var my_mcl:MovieClipLoader = new MovieClipLoader();
var list:Object = new Object();
list.onLoadInit = function(target)
{
var w:Number = target._width
var X:Number = w;
var i:Number = 1;
while (X < Stage.width)
{
my_mc = _root.createEmptyMovieClip('mc' + i++, i + 1);
my_mc._x = X;
my_mc.loadMovie('test.jpg');
X += w;
}
}
my_mcl.addListener(list);
my_mcl.loadClip('test.jpg',my_mc);