var banner = new Array(); banner[0]='http://i24.servimg.com/u/f24/13/84/67/42/banner13.jpg'; banner[1]='http://i24.servimg.com/u/f24/13/84/67/42/banner14.jpg'; banner[2]='http://i24.servimg.com/u/f24/13/84/67/42/banner15.jpg'; document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];