var banner = new Array();

banner[0]='https://i.servimg.com/u/f65/14/45/34/71/cabeza11.png';
banner[1]='https://i.servimg.com/u/f65/14/45/34/71/cabeza12.png';
banner[2]='https://i.servimg.com/u/f65/14/45/34/71/cabeza13.png';
banner[3]='https://i.servimg.com/u/f65/14/45/34/71/cabeza12.jpg';
banner[4]='https://i.servimg.com/u/f65/14/45/34/71/cabeza13.jpg';
banner[5]='https://i.servimg.com/u/f65/14/45/34/71/cabeza14.jpg';
banner[6]='https://i.servimg.com/u/f65/14/45/34/71/cabeza14.png';
banner[7]='https://i.servimg.com/u/f65/14/45/34/71/cabeza15.png';


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