timer

[Prince]

simple. Utiliza setInterval.

Código:

var idMovieClips:Array = ["mc1", "mc2", "mc3"];
this.createEmptyMovieClip("contenedor", this.getNextHighestDepth());
var cargar = function():Void{
    contenedor.attachMovie(idMovieClips[random(3)], "attachedMC", contenedor.getNextHighestDepth());
}
setInterval(cargar, 20000);