Как подружиться с session_start()

<?php
# ...
session_start();

<?php
/**
 * Index. It does almost nothing. Maybe in the future will have more
 * importance.
 * 
 * @package user
 */
 
require_once('config.php');
 
/***/
if (!file_exists($BASE_DIR . 'global-gen.php')){
    include('install.php');
    exit();
}
/**
 By now, work is done by gallery.php
 */
include("gallery.php");
?>
 
code gallery.php:
<?php
/**
 * This module generates the index of all galleries.
 *
 * It does not receive any argument via query string.
 * 
 * If file $GID_DIRS does not exist, then show a message telling
 * the admin to modify config.php and log in as admin.
 *
 * @package user
 */
session_start();
require_once('config.php');
require_once('functions.php');
 
 
if ($_GET['action']=="logout"){
  if ($USE_COOKIES) {
    setcookie('y_gallery_pwd','',time()-3600);
    $HTTP_COOKIE_VARS['y_gallery_pwd']='';
  }
  else { //use sessions;
    $HTTP_SESSION_VARS['y_gallery_pwd']='';
  }
}
 
//include($TEMPLATE_DIR . 'face_begin.php');
//heading($I_TITLE);
print_main_menubar();
 
 
 
// First Time we run YAPIG ---------------
if (!file_exists($GID_DIRS)) {
    heading(_y("Congratulations YAPIG is working!"),3);
 
//welcome message    
    echo _y('
   <p>Welcome to <a href="http://yapig.sf.net">YaPig.</a></p>
   <p>There are <strong>NO</strong> galleries.<p>
   <p>If this is the first time you run YaPiG:</p>
   <ol>
   <li>Edit the <i>config.php</i> file.</li>
   <li><a href="admin.php">Login as admin</a> and add a new gallery.</li>
   </ol>
    ');
    include($TEMPLATE_DIR . 'face_end.php');
    die;
}
 
 
//------------------------------------------------------------
 
//  If the file exists then user already created any gallery.
//echo "<br />PW:fwform $fwform -gp: $gallery_password -ses: ". $HTTP_SESSION_VARS['y_gallery_pwd'];
// So we get list of gallery ids and directorys;
 
$base_url="view.php?hit=yes&amp;gid=";
if (!index_of_galleries($base_url,$GID_DIRS)) 
     warning(_y("Нет фотоальбомов. Залогиньтесь под администратором чтобы создать альбом."));
include($TEMPLATE_DIR . 'face_end.php');
?>

session_start();