var banner = new Array();
    banner.push('http://i29.servimg.com/u/f29/15/99/99/08/logo_112.jpg');
    banner.push('http://i29.servimg.com/u/f29/15/99/99/08/logo_211.jpg');
    banner.push('http://i29.servimg.com/u/f29/15/99/99/08/logo_311.jpg');
    banner.push('http://i29.servimg.com/u/f29/15/99/99/08/logo_410.jpg');
    banner.push('http://hitskin.com/themes/16/92/03/i_logo.jpg');
    banner.push('http://i20.servimg.com/u/f20/11/38/94/07/halo_r10.jpg');

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