Imagenes aleatorias en flash??

[benti]

Hola he seguido el post pero no me funciona os pongo mi codigo.
stop();
aMovies = new Array();
aMovies[0] = "spot/foto1.jpg";
aMovies[1] = "spot/foto1.jpg";
aMovies[2] = "spot/foto3.jpg";
aMovies[3] = "spot/foto4.jpg";
aMovies[4] = "spot/foto5.jpg";
aMovies[5] = "spot/foto6.jpg";
aMovies[6] = "spot/foto7.jpg";
aMovies[7] = "spot/foto8.jpg";
aMovies[8] = "spot/foto9.jpg";
aMovies[9] = "spot/foto10.jpg";
aMovies[10] = "spot/foto11.jpg";
aMovies[11] = "spot/foto12.jpg";
aMovies[12] = "spot/foto13.jpg";
aMovies[13] = "spot/foto14.jpg";

aleatorio = random(aMovies.length)+1;
// he creado un mc vacio con nombre de instancia "pantalla"
pantalla.loadMovie(aMovies[aleatorio])