var banner = new Array();

banner[0]='https://i.servimg.com/u/f23/15/63/89/05/banner12.jpg';
banner[1]='https://i.servimg.com/u/f23/15/63/89/05/chakra11.jpg';
banner[2]='https://i.servimg.com/u/f23/15/63/89/05/onepie11.jpg';
banner[3]='https://i.servimg.com/u/f63/15/63/89/05/bleach10.jpg';

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