var banner = new Array();

banner[0]='https://i.imgur.com/egE2g.png';
banner[1]='https://i.imgur.com/FvP8b.png';
banner[2]='https://i.imgur.com/wZOlA.png';
banner[3]='https://i.imgur.com/LlDjP.png';
banner[4]='https://i.imgur.com/a9Uy8.png';

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