//affiche la div "id"
function montre(id)
{
   if(document.getElementById)
   {
      document.getElementById(id).style.display="block";
   }
   else if(document.all)
        {
           document.all[id].style.display="block";
        }
        else if(document.layers)
             {
                document.layers[id].display="block";
             }
}

//masque la div "id"
function cache(id)
{
   if(document.getElementById)
   {
      document.getElementById(id).style.display="none";
   }
   else if(document.all)
        {
           document.all[id].style.display="none";
        }
        else if(document.layers)
             {
                document.layers[id].display="none";
             }
}