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

if (numero == 0){
imagen = "https://i.servimg.com/u/f49/16/49/90/90/challe11.jpg";
break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f49/16/49/90/90/2117vi10.jpg";
break;}

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