var banner = new Array();

    banner.push('<a href="http://www.imagup.com/data/1119537187.html"><img src="http://data.imagup.com/9/1119537187.jpg" /></a>');
    banner.push('<a href="http://www.imagup.com/data/1119540347.html"><img src="http://data.imagup.com/9/1119540347.jpg" /></a>');
    banner.push('<a href="http://www.imagup.com/data/1119537187.html"><img src="http://data.imagup.com/9/1119537187.jpg" /></a>');

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