var banner = new Array();

banner[0]='http://i34.tinypic.com/15wjp0p.png';
banner[1]='http://i26.tinypic.com/2v2tj47.png';
banner[2]='http://i27.tinypic.com/2ur3z0h.jpg';
banner[3]='http://i35.tinypic.com/20b0kl5.jpg';
banner[4]='http://i50.tinypic.com/28vgm7r.png';
banner[5]='http://i32.tinypic.com/2ptpb0x.jpg';
banner[6]='http://img708.yfrog.com/img708/5239/segundacabezerafw.png';
banner[7]='http://img215.yfrog.com/img215/1593/terceracabezerafw.png';
banner[8]='http://i47.tinypic.com/25sx6vk.jpg';
banner[9]='http://i28.tinypic.com/vffkmb.jpg';
banner[10]='http://a.imageshack.us/img707/7425/cabecerafw.jpg';
banner[11]='http://a.imageshack.us/img84/162/cabeserafw2.jpg';
banner[12]='http://i29.tinypic.com/2uoifq8.jpg';
document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];