while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 1);

if (numero == 0){
imagen = "https://i.servimg.com/u/f41/15/21/32/26/000010.jpg";
break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f48/15/18/62/68/header12.jpg";
break;}

}
document.write('<a href="https://ghost-high.forumieren.com/" target="_self" ><img src="' + imagen + '" border=0 style="width: 700px; height: 450px"></a>');