var banners = new Array(); 
banners[0] = Array('<a href="http://skrotymeczow.net" target="_blank" title="Bramki"><img src="http://ilivescore.pl/images/skrotymeczow_160x160.jpg" alt="Bramki"></a>');
index = Math.floor(Math.random() * banners.length);
if (typeof banners[index] == 'object') document.write(banners[index][0]);
else document.write(banners[index]);