var banner = new Array();
banner.push('http://grandcercleceltique.files.wordpress.com/2013/12/bannic3a8re-gcc.jpg?w=350&h=143');
banner.push('http://www.tanialos.fr/Titre_203.jpg?v=1ygwdk4wh0q42ld');
banner.push('https://i.servimg.com/u/f56/11/18/24/93/edfinn10.png');
document.getElementById('pun-logo').firstChild.src=
banner[Math.floor(Math.random()*banner.length)];
setInterval("document.getElementById('pun-logo').firstChild.src=
banner[Math.floor(Math.random()*banner.length)];",3000);