var banner = new Array();

banner[0]='http://images.paraorkut.com/img/katrixupload/06d626c0580af8ee39aba1125e3ec7fa.jpg';
banner[1]='http://images.paraorkut.com/img/katrixupload/4300966001d074d6389558e02f2cde90.jpg';
banner[2]='http://images.paraorkut.com/img/katrixupload/974427e4ec0f74a7ace0b723d7b6f4bd.jpg';
banner[3]='http://images.paraorkut.com/img/katrixupload/261856a06b53286026529ca50c96207d.jpg';
banner[4]='http://images.paraorkut.com/img/katrixupload/f63935f0766caa4bfdc1c54fa62ab882.png';

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