function bann()
{
code_html = codebann[chiffre];
changement = 10;
document.getElementById("pub").innerHTML = code_html;
chiffre = parseInt(Math.random()*2);
window.setTimeout("bann()", (changement*1000));
}
codebann = new Array()
codebann[0] = '<a href="http://www.energie-ren.com/2008/home.html" target="_blank"><img src="img/pub.jpg"></a>';
chiffre = parseInt(Math.random()*1);