function chMenuTop(obj, div, link) {
      cleanMenu();
      obj.parentNode.className = 'select';
      if (link) {
         clearSubMenu(div);
         if (link != '#') {
            window.location.href = (link);
         }
         return true;
      }
      if (div) {
         clearSubMenu(div);
         document.getElementById(div).style.display = '';
         return true;
      }
   }

   /* limpa menus principais */
   function cleanMenu() {
      var menu = document.getElementsByTagName("li");
      for (i = 0; i<menu.length; i++) {
         menu[i].className = '';
      }
   }

   /* limpa sub menus */
   function clearSubMenu(active) {
      document.getElementById('inst').style.display = 'none';
      document.getElementById('espor').style.display = 'none';
      document.getElementById('info').style.display = 'none';
      document.getElementById('serv').style.display = 'none';
   }