var banner = new Array();

banner[0]='https://i.imgur.com/xtxX6yx.png';
banner[1]='https://i.imgur.com/kCzMArZ.png';
banner[2]='https://i.imgur.com/6rhF0n0.png';
banner[3]='https://i.imgur.com/jQkkH06.png';
banner[4]='https://i.imgur.com/aQxs4UY.png';

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