jQuery Mobile

<script language="javascript">

    $(document).ready(function(){
        $("#submit").click( function (){
            var username = $('#username').val();
            var password = $('#password').val();
            var token="";
            var nama="";
            var status="";
            var lastlogin="";

            if(username !='' && password !=''){
    if (username.indexOf("\"") != -1 || username.indexOf("'") != -1 || username.indexOf("<") != -1 || username.indexOf(">") != -1){
                    jAlert('Ada karakter aneh di field username', 'Forbiden Rules');
                    }// Ini tutup if jika Ada karakter aneh
                     else{
            $.ajax({
               type: "POST",
               url : 'http://www.berthojoris.com/login_cek.php',
               cache: false,
               data: {
                  username:$('#username').val(),
                  password:$('#password').val(),
               },
               dataType: "json",
               success: function (data) {
                    if (data.response=='SuksesLogin') {
                        ClearForm();
                        self.location="menu_admin.html";
                    } else {
                        jAlert('Username dan Password tidak cocok', 'Login Failed');
                        ClearForm();
                    }
                },
                error : function(data) {
                       jAlert('Koneksi anda sedang bermasalah.', 'Check Connection');
               }
      });
                    }

                }else{
                    jAlert('Field masih ada yg kosong', 'Field Empty');
                    document.forms["login"]["username"].focus();
            }

    });
});


    function ClearForm(){
        document.forms["login"]["username"].value = ""
        document.forms["login"]["password"].value = ""
        document.login.username.focus();
    }

</script>