I have here code that simply send input using mootols.js

here is my html code.
<title>Book Acquisition</title>
<script type="text/javascript" src="../js/mootools.js"></script>
<script type="text/javascript">
		window.addEvent('domready', function(){
	                $('registerForm').addEvent('submit', function(e) {
	                    new Event(e).stop();
	                    var log = $('log_res').empty().addClass('ajax-loading');
	                        update: log,
	                        onComplete: function() {

<form id ="registerForm"  action = "act1.php" method = "post">
<p><strong><label>Book Title:</label></strong><input type="text" name = "Title" placeholder = 'Title' required></p>

<div id="log">
		<div id="log_res">
		<!-- SPANNER -->
My problem is, I want to redirect when my validations is successful. I'm using my php code.
PHP Code:
<?php include'../connection/connect-db.php';
$Title $_POST['Title'];
     if (empty(
$Titles)) { 
'title is empty';
    }else {    
sql queriess..
saving successful..
header("Location: Book_new2.php");
My problem is when my validation is successful it doesn't redirect to my header. Its not working.
Any help.