var banner = new Array();

banner[0]='https://i.servimg.com/u/f48/15/88/16/49/gold_211.jpg';
banner[1]='https://i.servimg.com/u/f48/15/88/16/49/boton-16.jpg';
banner[2]='https://i.servimg.com/u/f48/15/88/16/49/gmr10.jpg';
banner[3]='https://i.servimg.com/u/f48/15/88/16/49/boton-17.jpg';
banner[4]='https://i.servimg.com/u/f48/15/88/16/49/boton-15.jpg';
banner[5]='https://i.servimg.com/u/f48/15/88/16/49/boton-14.jpg';

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