while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 5);

if (numero == 0){
imagen = "http://img823.imageshack.us/img823/3534/bannerlucaandyukikopie.gif";
break;}

if (numero == 1){
imagen = "http://img843.imageshack.us/img843/3639/banneryl.gif";
break;}

if (numero == 2){
imagen = "http://img230.imageshack.us/img230/3478/lucabannerkopie.gif";
break;}

if (numero == 3){
imagen = "http://img192.imageshack.us/img192/3853/yukibannerkopie.gif";
break;}

if (numero == 4){
imagen = "http://img255.imageshack.us/img255/2880/schachfigurenbannerkopi.gif";
break;}

if (numero == 5){
imagen = "http://img801.imageshack.us/img801/306/gruppenbannerkopie.gif";
break;}

}

document.write('<a href="https://forbidden-love.forumieren.com/forum.htm" target="_self" ><img src="' + imagen + '" border=0 style="width: 600px; height: 430px"></a>');