var banner = new Array();

banner[0]='https://i.servimg.com/u/f46/13/06/82/05/bancav11.jpg';
banner[1]='https://i.servimg.com/u/f46/13/06/82/05/bandam10.jpg';
banner[2]='https://i.servimg.com/u/f46/13/06/82/05/banang10.jpg';
banner[3]='https://i.servimg.com/u/f46/13/06/82/05/banhum10.jpg';


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