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

if (numero == 0){
imagen = "http://dl.dropbox.com/u/10155518/pi-rat10.jpg";
break;}

if (numero == 1){
imagen = "http://dl.dropbox.com/u/10155518/Widedrstand%20Zwecklos.jpg";
break;}

if (numero == 2){
imagen = "http://dl.dropbox.com/u/10155518/Aufdruck_01.jpg";
break;}
}
document.write('<a href="https://pi-raten.forumieren.com" target="_self" ><img src="' + imagen + '" border=0 style="width: 314px; height: 157px"></a>');