File Source for switch

<?php
/**
* @package languages
* @subpackage functions
* @version $Header$
*/
/**
* Initialization
*/
require_once( '../kernel/setup_inc.php' );
include_once( KERNEL_PKG_PATH.'BitBase.php' );
if (isset($_SERVER['HTTP_REFERER'])) {
$orig_url = $_SERVER['HTTP_REFERER'];
} else {
$orig_url = BIT_ROOT_URL;
}
if( !empty( $_GET['language'] ) ) {
if($gBitSystem->isFeatureActive( 'users_preferences' ) && $gBitUser->isRegistered() && $gBitSystem->isFeatureActive( 'users_change_language' ) ) {
$gBitUser->storePreference( 'bitlanguage', $_GET['language'] );
} else {
$_SESSION["bitlanguage"] = $_GET['language'];
// $gBitLanguage->mLanguage will be read again in the location: redirect
}
}
header("location: $orig_url");
exit;
?>

Source for file switch_lang.php