https://img15.hostingpics.net/pics/270208HEADERLAW.jpg

var banner = new Array();

banner[0]='https://img4.hostingpics.net/pics/453731HEADER11.jpg';
banner[1]='https://img4.hostingpics.net/pics/504988HEADER12.jpg';
banner[2]='https://img4.hostingpics.net/pics/137349HEADER13.jpg';

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