function UserClick() {
    // alert("User");
    // window.location.href = "/loginUser";
    window.location.href = "/loginUser";
  }
  function StaffClick() {
    // alert("Staff");
    // window.location.href = "/loginStaff";
    window.location.href = "/loginStaff";
  }
  function LeaderClick() {
    // alert("Leader");
    window.location.href = "/loginLecturer";
    // window.location.href = "/loginLecturer";
  }