function visibilite(thingId,txtAff,txtMasque)
{
       var targetElement; var targetElementLink;
       targetElement = document.getElementById(thingId) ;
       targetElementLink = document.getElementById(thingId+'Link');
       if (targetElement.style.display == "none")
       {
            targetElement.style.display = "" ;
            targetElementLink.innerHTML = txtMasque ;
       } else {
            targetElement.style.display = "none" ;
            targetElementLink.innerHTML = txtAff ;
       }
}