function OpenLayerOnce(id){
    if(document.getElementById(id).style.display == "none") {
       document.getElementById(id).style.display = "block" ;
      }
    window.status =  document.getElementById(id).style.display;
   }
  
  function OpenLayer(id){
    if(document.getElementById(id).style.display == "none") {
       document.getElementById(id).style.display = "block" ;
      }
	else{
       document.getElementById(id).style.display = "none" ;
      }  
    window.status =  document.getElementById(id).style.display;
   }
  function CloseLayer(id_layer){
    document.getElementById(id_layer).style.display = "none" ;
   }
  function form_confirm(formulaire,texte){
     if(confirm(texte))
	   {formulaire.submit();}
    }