var banner = new Array();

banner.push('https://i.servimg.com/u/f20/16/00/36/37/bannie10.jpg');
banner.push('https://i.servimg.com/u/f20/16/00/36/37/bannie10.jpg');
banner.push('https://i.servimg.com/u/f20/16/00/36/37/bannie10.jpg');


document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];