var banner = new Array();
 
banner.push('http://img67.xooimage.com/files/f/8/c/ban-ess-dasta-2eebbd1.png');
banner.push('http://img67.xooimage.com/files/f/8/c/ban-ess-dasta-2eebbd1.png');
 
document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];