var banner = new Array();

banner[0]='http://i43.servimg.com/u/f43/14/43/42/01/bannov10.jpg';
banner[1]='http://i43.servimg.com/u/f43/14/43/42/01/bannov11.jpg';


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