var banner = new Array(); banner[0]='https://i.servimg.com/u/f58/18/44/39/39/banner15.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)];",3000);