<script>
$(document).on("click", "#submit", function(event)
{
    var user = document.getElementById("name").value;
    var pwd = document.getElementById("pwd").value;
    $.post("userExistCheck.php",
    {
        userName: user,
        userPass: pwd
    },
    function(result)
    {
      if (result == "0")
      {
        window.location.replace("Moment/momentApp.php");
      }
      else if (result == "1")
      {
        alert("Password is incorrect!");
      }
      else
      {
        alert("User does not exist!");
      }
    });
})
</script>