var banners = new Array(); 
//banners[0] = '<iframe allowtransparency="true" src="http://www.ladbrokes.com/ast?action=asset_req&new=1&aff_id=37943&asset_id=6602" width="750" height="100" marginwidth="0" marginheight="0" scrolling="no" frameborder="0" style="border-width:0"></iframe>';
banners[0] = '<a href="http://www.tojedobre.pl" target="_blank"><img src="http://betonline.net.pl/images/tojedobre7.jpg" border="0" width="750" height="100" alt="to je dobre" /></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]);