function LienAuHasard()
{
    Url = new Array;
    base = "/voyage-sur-mesure/Agora-conference/conference/";
				Url[0] = "conference-nantes";
				Url[1] = "conference-lille";

    ChoixLien = Math.floor(Math.random() * Url.length);
    window.open(base + Url[ChoixLien],'_parent');
}