var banners = new Array(); 
banners[0] = Array('<a href="http://ilivescore.pl" target="_blank"><img src="http://betonline.net.pl/images/ilivescore_750_100.jpg" alt="live score"></a>', '<a href="http://ilivescore.pl" target="_blank"></a>');
banners[1] = Array('<a href="http://meczenazywo.eu" target="_blank"><img src="http://meczenazywo.eu/images/meczenazywo_750x100.gif" alt="mecze live"></a>', '<a href="http://meczenazywo.eu" target="_blank"></a>');

index = Math.floor(Math.random() * banners.length);
if (typeof banners[index] == 'object') document.write(banners[index][0] + '<span class="text">' + banners[index][1] + '</span>');
else document.write(banners[index]);