';
adlink[1] = '
';
break;
case 468:
// small banner
adlink[0] = '
';
adlink[1] = '
';
adlink[2] = '
';
break;
case 120:
// skyscraper
adlink[0] = '
';
adlink[1] = '
';
break;
default: result = 'unknown';
}
// pick random array element
var randomNum = Math.floor ( Math.random() * adlink.length);
var selectedAd = adlink[randomNum];
document.write(selectedAd);
}