while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio *3);

if (numero == 0){
imagen = "http://img5.imageshack.us/img5/6352/bannerxc.png";
break;}

if (numero == 1){
imagen = "http://img190.imageshack.us/img190/6913/ccbannerp.png";
break;}

if (numero == 2){
imagen = "http://img155.imageshack.us/img155/4705/asgbannerr.png";
break;}

if (numero == 3){
imagen = "http://imageshack.us/m/222/8403/jtzj.png";
break;}


}
document.write('<a href="https://ff-truelegacy.forumieren.com/" target="_self" ><img src="' + imagen + '" border=0 style="width: 580px; height: 326px"></a>');