while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 05);

if (numero == 1){
imagen = "http://img132.imageshack.us/img132/3770/logo2wks.png";
break;}

if (numero == 2){
imagen = "http://img132.imageshack.us/img132/5931/logo3n.png";
break;}

if (numero == 3){
imagen = "http://img33.imageshack.us/img33/2123/logo4vfy.png";
break;}

if (numero == 4){
imagen = "http://img10.imageshack.us/img10/1227/logo5s.png";
break;}

if (numero == 5){
imagen = "http://img268.imageshack.us/img268/4521/logo6u.png";
break;}

}
document.write('<a href="http://amaterasunofansub.foroactivo.net/" target="_self" ><img src="' + imagen + '" border=0 style="width: 985px; height: 275px"></a>');