var banner = new Array();

banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie10.jpg');
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie11.jpg');
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie12.jpg');
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie13.jpg'); 
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie14.jpg'); 
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie15.jpg'); 
banner.push('http://i24.servimg.com/u/f24/13/94/72/47/bannie16.jpg'); 

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