var banner = new Array();
 
banner.push('https://img11.hostingpics.net/pics/283159qu2.png');
banner.push('https://www.zupimages.net/up/15/48/jn9k.png');
banner.push('https://www.zupimages.net/up/15/48/bqvo.png');
 
document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];