while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 2);

if (numero == 0){
imagen = "https://i.servimg.com/u/f64/15/54/20/80/i_logo10.jpg";
break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f64/15/54/20/80/untitl10.jpg";
break;}


}
document.write('<a href="https://4-elements.forumieren.com/forum" target="_self" ><img src="' + imagen + '" border=0 style="width: 720px; height: 250px"></a>')