var banner = new Array(); banner[0]='https://i.servimg.com/u/f68/18/73/00/97/aa11.gif'; banner[1]='https://i.servimg.com/u/f68/18/73/00/97/untitl10.gif'; 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);