function showDiv(divn) {
      if (document.getElementById(divn).style.display=="block") {
         document.getElementById(divn).style.display="none";
//         document.getElementById(divn + 'a').style.display="none";
      }
      else {
         document.getElementById(divn).style.display="block";
//         document.getElementById(divn + 'a').style.display="block";
      }
   }