var banner = new Array();

banner[0]='https://i.servimg.com/u/f31/17/71/98/94/logona10.png';
banner[1]='https://i.servimg.com/u/f31/17/71/98/94/logogr10.png';
banner[2]='https://i.servimg.com/u/f31/17/71/98/94/logolu10.png';
banner[3]='https://i.servimg.com/u/f39/17/39/81/06/logoer10.png';
banner[4]='https://i.servimg.com/u/f31/17/71/98/94/logoha10.png';

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