Si, hai ragione scusami....
codice:
<?php
setlocale(LC_ALL, 'it_IT');
define('ROOT_DIR', $_SERVER["DOCUMENT_ROOT"]."/intranet/");
include ROOT_DIR .'/dwhTest/inc/defineTest.php';
get_ob_gzhandler();
get_header();//dentro questa funzione c'è l'head della pagina con questi file:
<!--DOCTYPE html>
	<html lang='en'>
	  <head>
		<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>
		<meta charset='utf-8'>
		<meta http-equiv='Content-Language' content='it' >
		<meta name='Robots' content='All' >
		<meta http-equiv='X-UA-Compatible' content='IE=edge'>
		<meta name='viewport' content='width=device-width, initial-scale=1'>
		<title>DataTables | Gentelella</title>
		<script src='../gentelella/jquery/dist/jquery.min.js'></script>
		<!-- Bootstrap -->
		<link href='../gentelella/bootstrap/dist/css/bootstrap.min.css' rel='stylesheet'>
		<!-- Custom Theme Style -->
		<link href='../gentelella/build/css/custom.min.css' rel='stylesheet'>
		<link href='../gentelella/build/css/font-awesome.css' rel='stylesheet'>
		<style>
		body{background-color:#FFF}
		</style>
	</head-->
<script>
$(document).ready(function() {
	$('#datatable').dataTable({
		"paginate": true,
		"sort": false
	});
});
</script>
<body>
<div id="container" class="container">
<!-- dentro "container" ho le mie funzioni in php, con le quali visualizzo la tabella HTML con i dati, questo div è quello che vado ad aggiornare-->
</div>
<?php get_footer();//questa funzione contiene?>

<!--script src='../gentelella/jquery/dist/jquery.min.js'></script><script src='../gentelella/bootstrap/dist/js/bootstrap.min.js'></script>
<script src='../gentelella/datatables.net/js/jquery.dataTables.min.js'></script>
<script src='../gentelella/datatables.net-bs/js/dataTables.bootstrap.min.js'></script>
<link rel='stylesheet' href='../gentelella/datetimepiker/bootstrap-datetimepicker.min.css' />
<script src='../gentelella/datetimepiker/moment.min.js'></script>
<script src='../gentelella/datetimepiker/bootstrap-datetimepicker.min.js'></script-->


</body>
</html>
?>
Grazie mille.