var banner = new Array();

banner[0]='https://i751.photobucket.com/albums/xx155/tahorisan/uyiyuiyui.png';
banner[1]='https://i751.photobucket.com/albums/xx155/tahorisan/sdfsdfsdfsdfsdf.png';
banner[2]='https://i751.photobucket.com/albums/xx155/tahorisan/kjlkjlkjl.png';
banner[3]='https://i751.photobucket.com/albums/xx155/tahorisan/dssfsdfsdf.png';
banner[4]='https://i751.photobucket.com/albums/xx155/tahorisan/asadasdasdasd.png';
banner[5]='https://i558.photobucket.com/albums/ss30/ikiruh-kun/sdvdf-1.png';

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