var banner = new Array(); banner[0]='https://i.imgur.com/PTPxFYr.png';  banner[1]='https://i.imgur.com/SSbkje8.png';  banner[2]='https://i.imgur.com/sjwSxZ9.png';  banner[3]='https://i.imgur.com/eMTOckp.png';  banner[4]='https://i.imgur.com/gzEOd8A.png';  document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];