function showSubmenu(id){
  document.getElementById("sub2").style.display = 'none';
  document.getElementById("sub1").style.display = 'none';
  document.getElementById("sub"+id).style.display = 'block';
}

function hideSubmenu(id){
  document.getElementById("sub2").style.display = 'none';
  document.getElementById("sub1").style.display = 'none';
  //document.getElementById("sub"+id).style.display = 'block';
}

function login(){
  var loginUsername = document.getElementById("loginUsername").value;
  var loginPassword = document.getElementById("loginPassword").value;
  if (loginUsername != "" && loginPassword != ""){
    document.getElementById("loginForm").action = '../dialog/login.php';
    document.getElementById("loginForm").submit();  
  }
}

function logout(){
  location.href = '../dialog/logout.php';
}