var banner = new Array();

banner[0]='<a href="http://www.servimg.com/image_preview.php?i=301&u=11176967"  target="_blank" ><img src="http://i87.servimg.com/u/f87/11/17/69/67/th/1684-p10.jpg" border="0" alt="Image hébergée par servimg.com" /></a>_1';
banner[1]='<a href="http://www.servimg.com/image_preview.php?i=302&u=11176967"  target="_blank" ><img src="http://i87.servimg.com/u/f87/11/17/69/67/th/24076110.jpg" border="0" alt="Image hébergée par servimg.com" /></a>_2
';
banner[2]='<a href="http://www.servimg.com/image_preview.php?i=303&u=11176967" target="_blank" ><img src="http://i87.servimg.com/u/f87/11/17/69/67/drain_10.jpg" border="0" alt="Image hébergée par servimg.com" /></a>_3';

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