Редирект авторизованного пользователя со страницы регистрации

Помогите пожалуйста, нужно чтобы сразу после регистрации пользователя перекидывало уже авторизованным на секретную страницу intropage.php

А также после авторизации перекидывало на страницу intropage.php, в файле login.php редирект на intropage.php есть, но ничего не происходит.

Регистрация

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

<?php include("includes/header.php"); ?>





	<?php



if(isset($_POST["register"])){





if(!empty($_POST['full_name']) && !empty($_POST['email']) && !empty($_POST['username']) && !empty($_POST['password'])) {

	$full_name=$_POST['full_name'];

	$email=$_POST['email'];

	$username=$_POST['username'];

	$password=$_POST['password'];

	



		

	$query=mysql_query("SELECT * FROM usertbl WHERE username='".$username."'");

	$numrows=mysql_num_rows($query);

	

	if($numrows==0)

	{

	$sql="INSERT INTO usertbl

			(full_name, email, username,password) 

			VALUES('$full_name','$email', '$username', '$password')";



	$result=mysql_query($sql);





	if($result){

	 $message = "Account Successfully Created";

	} else {

	 $message = "Failed to insert data information!";

	}



	} else {

	 $message = "That username already exists! Please try another one!";

	}



} else {

	 $message = "All fields are required!";

}

}

?>





<?php if (!empty($message)) {echo "<p class=\"error\">" . "MESSAGE: ". $message . "</p>";} ?>

	

<div class="container mregister">

			<div id="login">

	<h1>REGISTER</h1>

<form name="registerform" id="registerform" action="register.php" method="post">

	<p>

		<label for="user_login">Full Name<br />

		<input type="text" name="full_name" id="full_name" class="input" size="32" value=""  /></label>

	</p>

	

	

	<p>

		<label for="user_pass">Email<br />

		<input type="email" name="email" id="email" class="input" value="" size="32" /></label>

	</p>

	

	<p>

		<label for="user_pass">Username<br />

		<input type="text" name="username" id="username" class="input" value="" size="20" /></label>

	</p>

	

	<p>

		<label for="user_pass">Password<br />

		<input type="password" name="password" id="password" class="input" value="" size="32" /></label>

	</p>	

	



		<p class="submit">

		<input type="submit" name="register" id="register" class="button" value="Register" />

	</p>

	

	<p class="regtext">Already have an account? <a href="login.php" >Login Here</a>!</p>

</form>

	

	</div>

	</div>

	

	

	

	<?php include("includes/footer.php"); ?>

Авторизация

<?php

session_start();

?>



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

<?php include("includes/header.php"); ?>



<?php



if(isset($_SESSION["session_username"])){

// echo "Session is set"; // for testing purposes

header("Location: intropage.php");

}



if(isset($_POST["login"])){



if(!empty($_POST['username']) && !empty($_POST['password'])) {

    $username=$_POST['username'];

    $password=$_POST['password'];



    $query =mysql_query("SELECT * FROM usertbl WHERE username='".$username."' AND password='".$password."'");



    $numrows=mysql_num_rows($query);

    if($numrows!=0)



    {

    while($row=mysql_fetch_assoc($query))

    {

    $dbusername=$row['username'];

    $dbpassword=$row['password'];

    }



    if($username == $dbusername && $password == $dbpassword)



    {





    $_SESSION['session_username']=$username;



    /* Redirect browser */

    header("Location: intropage.php");

    }

    } else {



 $message =  "Invalid username or password!";

    }



} else {

    $message = "All fields are required!";

}

}

?>









    <div class="container mlogin">

            <div id="login">

    <h1>LOGIN</h1>

<form name="loginform" id="loginform" action="" method="POST">

    <p>

        <label for="user_login">Username<br />

        <input type="text" name="username" id="username" class="input" value="" size="20" /></label>

    </p>

    <p>

        <label for="user_pass">Password<br />

        <input type="password" name="password" id="password" class="input" value="" size="20" /></label>

    </p>

        <p class="submit">

        <input type="submit" name="login" class="button" value="Log In" />

    </p>

        <p class="regtext">No account yet? <a href="register.php" >Register Here</a>!</p>

</form>



    </div>



    </div>

	

	<?php include("includes/footer.php"); ?>

	

	<?php if (!empty($message)) {echo "<p class=\"error\">" . "MESSAGE: ". $message . "</p>";} ?>