function popmenu(azione){

   if (azione == "open"){
      //document.getElementById('flash').style.visibility="hidden";
      document.getElementById('popmenu').style.visibility="visible";
   }
   if (azione == "close"){
      //document.getElementById('flash').style.visibility="visible";
      document.getElementById('popmenu').style.visibility="hidden";
   }
   if (azione == "openrm"){
      //document.getElementById('flash').style.visibility="hidden";
      document.getElementById('popmenu').style.visibility="visible";
      document.getElementById('subpopmenu').style.visibility="visible";
   }
   if (azione == "closerm"){
      //document.getElementById('flash').style.visibility="visible";
      document.getElementById('subpopmenu').style.visibility="hidden";
      document.getElementById('popmenu').style.visibility="hidden";
   }
   if (azione == "openvt"){
      //document.getElementById('flash').style.visibility="hidden";
      document.getElementById('vtmenu').style.visibility="visible";
   }
   if (azione == "closevt"){
      //document.getElementById('flash').style.visibility="visible";
      document.getElementById('vtmenu').style.visibility="hidden";
   }
}