javascript

<script type="text/javascript">

        var kesempatan= 0;
        function validasi(form) {

            var tUser = document.getElementById('user').value;
            var tPass = document.getElementById('pass').value;

            if ( tUser == "admin" && tPass == "admin") {
                alert("Log In Berhasil");
                return false;
            }
            else{
                kesempatan ++;
                alert("Kamu Salah "+kesempatan+" Kali -_-");
                if (kesempatan==3) {
                    alert("ANDA DI BLOKIR");
                    document.getElementById("user").disabled = true;
                    document.getElementById("pass").disabled = true;
                    document.getElementById("masuk").disabled = true;
                    return false;
                }
            }
        }