التوجيه لصفحة اخرى (بعد تسجيل الدخول ) لا يعمل

السلام عليكم

لدي مشكلة في اعادة توجيه المستخدم عند تسجيل الدخول المستخدم user & password

يقوم بفتح نفس الصفحة login.php

المشكلة انه

الموقع كان يعمل قبل رفعه على السيرفر اونلاين (على هذا الموقع bytehost24.com )

حيث انني كنت اعمل على localhost باستخدام ال wamp واستخدام ال Dreamweaver

هذا كود ال php لعمل اللlogin

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<?php require_once("includes/session.php"); ?>
<?php require_once("includes/connection.php"); ?>
<?php require_once("includes/functions.php"); ?>
<?php

	if (logged_in()) {

		header("Location: home.html");
		//redirect_to("home.html");
	}

	include_once("includes/form_functions.php");

	// START FORM PROCESSING
	if (isset($_POST['submit'])) { // Form has been submitted.
		$errors = array();

		// perform validations on the form data
		$required_fields = array('username', 'password');
		$errors = array_merge($errors, check_required_fields($required_fields, $_POST));

		$fields_with_lengths = array('username' => 30, 'password' => 30);
		$errors = array_merge($errors, check_max_field_lengths($fields_with_lengths, $_POST));

		$username = trim(mysql_prep($_POST['username']));
		$password = trim(mysql_prep($_POST['password']));
		$hashed_password = sha1($password);

		if ( empty($errors) ) {
			// Check database to see if username and the hashed password exist there.
			$query = "SELECT id, username ";
			$query .= "FROM register ";
			$query .= "WHERE username = '{$username}' ";
			$query .= "AND password = '{$hashed_password}' ";
			$query .= "LIMIT 1";
			$result_set = mysql_query($query);
			confirm_query($result_set);
			if (mysql_num_rows($result_set) == 1) {
				// username/password authenticated
				// and only 1 match
				$found_user = mysql_fetch_array($result_set);
				$_SESSION['user_id'] = $found_user['id'];
				$_SESSION['username'] = $found_user['username'];
				$_SESSION['stage'] = $found_user['stage'];

				header("Location: home.html");
				//redirect_to("home.html");
			} else {
				// username/password combo was not found in the database
				$message = "Username/password combination incorrect.<br />
					Please make sure your caps lock key is off and try again.";
			}
		} else {
			if (count($errors) == 1) {
				$message = "There was 1 error in the form.";
			} else {
				$message = "There were " . count($errors) . " errors in the form.";
			}
		}

	} else { // Form has not been submitted.
		if (isset($_GET['logout']) && $_GET['logout'] == 1) {
			$message = "You are now logged out.";
		} 
		$username = "";
		$password = "";
	}
?>