var banner = new Array();

banner.push('https://i.servimg.com/u/f70/16/20/30/72/mmmm1010.jpg');
banner.push('https://i.servimg.com/u/f29/16/39/51/95/wallpa11.jpg');
banner.push('https://i.servimg.com/u/f70/16/20/30/72/jeux_v10.jpg');


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

setInterval("document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];",6000);