var banner = new Array();

banner[0]='https://nsa08.casimages.com/img/2009/08/30//090830095323851304.png';
banner[1]='https://nsa07.casimages.com/img/2009/08/30//090830095759226993.png';
banner[2]='http://moe.mabul.org/up/moe/2009/08/27/img-0717211ggb8.png';

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

setInterval("document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];",10000);