var nombre = 2;
    var temps = new Date()
    var seconde = temps.getSeconds()
    var banniere = seconde % nombre;
    banniere +=1;
    if (banniere==1) {
    url="http://www.gabriellah-medium.com/";
    alt="Gabriellah Clairvoyante";
    banner="pub/bas-page/gabriellah_clairvoyante.gif";
    width="300";
    height="100";
    }
    if (banniere==2) {
    url="http://www.fermontours.com/";
    alt="Voyages Fermontours";
    banner="pub/bas-page/Voyages_fermontours.jpg";
    width="300";
    height="100";
    }

    document.write('<a href=\"'+url+'\" target=\"_blank\">');
    document.write('<img src=\"'+banner+'\" width=')
    document.write(width+'height='+height+'');
    document.write('alt=\"'+alt+'\" border=0></a>');