var banner = new Array(); banner[0]='https://i.servimg.com/u/f97/14/55/36/34/art-to10.gif'; banner[1]='https://i.servimg.com/u/f97/14/55/36/34/art-to11.gif'; banner[2]='https://i.servimg.com/u/f97/14/55/36/34/art-to12.gif'; document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];