function user_name()
  {
    user = document.getElementById("username");
    user.style.display = 'none';
    users = document.getElementById("loginname");
    users.style.backgroundColor = '#ffffff';
  }
  function pass_word()
  {
    pass = document.getElementById("password");
    pass.style.display = 'none';
    users = document.getElementById("loginpassword");
    users.style.backgroundColor = '#ffffff';
  }