var banner = new Array();

banner[0]='http://img802.imageshack.us/img802/4453/bannerlt.jpg';
banner[1]='http://img833.imageshack.us/img833/2125/commissionsatoshisaotom.jpg';
banner[2]='http://img863.imageshack.us/img863/6492/gifnarutoshippuden1.gif';

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