function showHide(action) {
          var obj = GetElementsWithClassName('*','hideme')[0];
          switch (action) {
          case 's': obj.style.visibility = 'visible'; break;
          case 'h': obj.style.visibility = 'hidden'; break;
          case 'k':
                  if (obj.style.visibility != 'visible') {
                          obj.style.visibility = 'visible';
                  } else {
                          obj.style.visibility = 'hidden';
                  }
          break;
          }
  }