var banner = new Array();     banner[0]='https://i1221.photobucket.com/albums/dd467/nurita2/summercaaa_zps373be0fa.png';     banner[1]='https://i1221.photobucket.com/albums/dd467/nurita2/campsum31_zpsf342c92a.png';         document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];     setInterval("document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];",8000);