var banner = new Array();

banner.push('https://i.servimg.com/u/f67/14/57/73/69/modern15.jpg');
banner.push('https://i.servimg.com/u/f67/14/57/73/69/black210.jpg');
banner.push('https://i.servimg.com/u/f67/14/57/73/69/cod4pc12.jpg');
banner.push('https://i.servimg.com/u/f67/14/57/73/69/bannie11.jpg');
banner.push('https://i.servimg.com/u/f67/14/57/73/69/bbbbbb14.jpg');
banner.push('https://i.servimg.com/u/f67/14/57/73/69/black_10.jpg');

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

setInterval("document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];",3000);