var banner = new Array();

          banner.push('http://image.noelshack.com/fichiers/2015/03/1421182997-dbrst4.png');
          banner.push('http://image.noelshack.com/fichiers/2015/03/1421183306-dbrst-2.png');
          banner.push('http://i59.tinypic.com/ipqs8g.png');
 	  banner.push('http://i58.tinypic.com/2rohq8k.png');

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