var banner = new Array();

banner[0]='http://img607.imageshack.us/img607/6902/fairytail1q.jpg';
banner[1]='http://img856.imageshack.us/img856/5357/naruto1kp.jpg';
banner[2]='https://i1088.photobucket.com/albums/i333/JDCool123/hhhh.jpg';

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