while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 4);

if (numero == 0){
imagen = "https://i.servimg.com/u/f35/17/80/37/79/in_a_l13.jpg";
break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f35/17/80/37/79/in_a_l12.jpg";
break;}

if (numero == 2){
imagen = "https://i.servimg.com/u/f35/17/80/37/79/in_a_l11.jpg";
break;}

if (numero == 3){
imagen = "https://i.servimg.com/u/f35/17/80/37/79/in_a_l15.jpg";
break;}

if (numero == 4){
imagen = "https://i.servimg.com/u/f35/17/80/37/79/in_a_l14.jpg";
break;}

}
document.write('<a href="https://sing-a-lullaby.forumieren.com/" target="_self" ><img src="' + imagen + '" border=0 style="width: 900px; height: 450px"></a>');