var banner = new Array();

banner[0]='http://img269.imageshack.us/img269/3319/78097992.png';
banner[1]='http://img160.imageshack.us/img160/653/39617154.png';
banner[2]='http://img15.imageshack.us/img15/3872/59711446.png';
banner[3]='http://img15.imageshack.us/img15/2503/98851599.png';
banner[4]='http://img18.imageshack.us/img18/299/39847244.png';
banner[5]='http://img15.imageshack.us/img15/8105/40435534.png';

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