var banner = new Array();

banner[0]='https://i.servimg.com/u/f19/12/59/88/86/bannia24.jpg';
banner[1]='https://i.servimg.com/u/f19/12/59/88/86/bannia25.jpg';
banner[2]='https://i.servimg.com/u/f19/12/59/88/86/bannia26.jpg';
banner[3]='https://i.servimg.com/u/f19/12/59/88/86/bannia27.jpg';
banner[4]='https://i.servimg.com/u/f69/12/59/88/86/bannia16.jpg';
banner[5]='https://i.servimg.com/u/f19/12/59/88/86/bannia29.jpg';
banner[6]='https://i.servimg.com/u/f19/12/59/88/86/bannia30.jpg';
banner[7]='https://i.servimg.com/u/f19/12/59/88/86/bannia31.jpg';
banner[8]='https://i.servimg.com/u/f19/12/59/88/86/bannia32.jpg';
banner[9]='https://i.servimg.com/u/f69/12/59/88/86/bannia10.jpg';
banner[10]='https://i.servimg.com/u/f69/12/59/88/86/bannia11.jpg';
banner[11]='https://i.servimg.com/u/f69/12/59/88/86/bannia13.jpg';
banner[12]='https://i.servimg.com/u/f69/12/59/88/86/bannia15.jpg';
banner[13]='https://i.servimg.com/u/f69/12/59/88/86/bannia18.jpg';

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