function showMenu(parentId, childId) {
    if (document.getElementById(childId) != null) {;
      
      var parent = document.getElementById(parentId);
      var child = document.getElementById(childId);
      child.style.top = parseInt(parent.offsetTop) + parseInt(parent.offsetHeight);
      child.style.left = parseInt(parent.offsetLeft);
      child.style.visibility = 'visible';
      //alert(parseInt(parent.offsetLeft));
    }
  }
  function showDiv(divId) {
    if (document.getElementById(divId) != null) {;
      document.getElementById(divId).style.visibility = 'visible';
    }
  }
  function hideDiv(divId) {
    if (document.getElementById(divId) != null) {;
      document.getElementById(divId).style.visibility = 'hidden';
    }
  }