while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 7);

if (numero == 0){
imagen = "https://i.servimg.com/u/f33/15/83/85/50/walli110.jpg";
break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f33/15/83/85/50/walli410.jpg";
break;}

if (numero == 2){
imagen = "https://i.servimg.com/u/f33/15/83/85/50/walli310.jpg";
break;}

if (numero == 3){
imagen = "https://i.servimg.com/u/f33/15/83/85/50/walli410.jpg";
break;}

}
document.write('<a href="https://thetwilightrpg.forumieren.org/forum" target="_self" ><img src="' + imagen + '" border=0 style="width: 950px; height: 475px"></a>');