var banner = new Array();

banner[0]='http://i67.servimg.com/u/f67/13/57/00/21/ofw11110.gif';
banner[1]='http://i67.servimg.com/u/f67/13/57/00/21/ostw1b11.gif';
banner[2]='http://i47.servimg.com/u/f47/13/57/00/21/ln31010.jpg';
banner[3]='http://i67.servimg.com/u/f67/13/57/00/21/aaabb210.jpg';
banner[4]='http://i67.servimg.com/u/f67/13/57/00/21/saving11.jpg';
banner[5]='http://i37.servimg.com/u/f37/13/57/00/21/ln210.jpg';
banner[6]='http://i37.servimg.com/u/f37/13/57/00/21/camo_d11.jpg';
document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];