function hide(id) {
      if (document.getElementById(id).className == "form_premiere_inscription_hidden") {
         document.getElementById(id).className = "form_premiere_inscription_visible";
      } else {
         document.getElementById(id).className = "form_premiere_inscription_hidden";
      }
   }
function formulaire_etape(id) {
      if (document.getElementById(id).className == "form_premiere_inscription_etape_on") {
         document.getElementById(id).className = "form_premiere_inscription_etape_off";
      } else {
         document.getElementById(id).className = "form_premiere_inscription_etape_on";
      }
   }