document.observe('dom:loaded', function(){
   $$('.entete').each(function(item) {
   Elts = item.parentNode.getElementsByTagName('div');
   Elts[0].style.display = 'none';
   item.onclick = function(){
         subElt = this.parentNode.getElementsByTagName('div');
         subElt = subElt[0];
         styleElt = this.firstChild;
         if( subElt.style.display == 'none'){
           subElt.style.display ='block';
           styleElt.className = styleElt.className.replace("plus", "moins");
         }else{
              subElt.style.display ='none';
              styleElt.className = styleElt.className.replace("moins", "plus");
          }
   };
  });			
});