var banner = new Array();

banner.push('https://i.servimg.com/u/f18/14/08/51/72/star_m11.png');
banner.push('http://i49.tinypic.com/rbwkkl.png');
banner.push('http://i49.tinypic.com/i6i7u1.png');


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