help on loading to another page if the password is correct

<?php

// database connect script.

require 'db_connect.php';

if($logged_in == 1) {
    die('You are already logged in, '.$_SESSION['username'].'.');

}


?>
 <?php

} else {    // if form hasn't been submitted

?>



 </tr>
 <tr>
  <td><h1>Login</h1>
   <form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
    <table align="center" border="1" cellspacing="0" cellpadding="3">
     <tr>
      <td>Username:</td>
      <td> <input type="text" name="uname" maxlength="40"> </td>
     </tr>
     <tr>
      <td>Password:</td>
      <td> <input type="password" name="passwd" maxlength="50"> </td>
     </tr>
     <tr>
      <td colspan="2" align="right"> <input type="submit" name="submit" value="Login">
      </td>
     </tr>
    </table>
   </form>
   <?php
}
?>
   <a href="register.php">Click Here</a> if you have not register</td>
 </tr>
</table>
<h1>&</h1>
</body>
</html>