AJAX навигация в теге Custom - реализация

<?php
/*
 Автор: Sander
 http://sandev.pro/
*/
@error_reporting ( E_ALL ^ E_WARNING ^ E_NOTICE );
@ini_set ( 'display_errors', true );
@ini_set ( 'html_errors', false );
@ini_set ( 'error_reporting', E_ALL ^ E_WARNING ^ E_NOTICE );

define( 'DATALIFEENGINE', true );
define( 'ROOT_DIR', substr( dirname(  __FILE__ ), 0, -12 ) );
define( 'ENGINE_DIR', ROOT_DIR . '/engine' );

include ENGINE_DIR . '/data/config.php';
require_once ENGINE_DIR . '/classes/mysql.php';
require_once ENGINE_DIR . '/data/dbconfig.php';
require_once ENGINE_DIR . '/modules/functions.php';
require_once ENGINE_DIR . '/classes/templates.class.php';

dle_session();

require_once ENGINE_DIR . '/modules/sitelogin.php';
require_once ROOT_DIR . '/language/' . $config['langs'] . '/website.lng';
@header( "Content-type: text/html; charset=" . $config['charset'] );

if(!$is_logged) $member_id['user_group'] = 5;

//################# Определение групп пользователей
$user_group = get_vars( "usergroup" );
if( ! $user_group ) {
	$user_group = array ();
	$db->query( "SELECT * FROM " . USERPREFIX . "_usergroups ORDER BY id ASC" );
	while ( $row = $db->get_row() ) {
		$user_group[$row['id']] = array ();
		foreach ( $row as $key => $value ) $user_group[$row['id']][$key] = stripslashes($value);
	}
	set_vars( "usergroup", $user_group );
	$db->free();
}

//################# Определение категорий и их параметры
$cat_info = get_vars( "category" );
if( ! is_array( $cat_info ) ) {
	$cat_info = array ();
	$db->query( "SELECT * FROM " . PREFIX . "_category ORDER BY posi ASC" );
	while ( $row = $db->get_row() ) {
		$cat_info[$row['id']] = array ();
		foreach ( $row as $key => $value ) $cat_info[$row['id']][$key] = stripslashes( $value );
	}
	set_vars( "category", $cat_info );
	$db->free();
}

$tpl = new dle_template( );
$tpl->dir = ROOT_DIR . '/templates/'.$config['skin'];
define( 'TEMPLATE_DIR', $tpl->dir );

$id = $db->safesql( trim( $_GET['id'] ) );
if( $id == "" OR !$_SESSION['custom_'.$id]) die();
$page = intval($_GET['page']);
if($page<1) $page = 1;
$ajax_adds = true;

if( preg_match( "#limit=['\"](.+?)['\"]#i", $_SESSION['custom_'.$id]['string'], $match ) ) $custom_limit = intval($match[1]);
else $custom_limit = $config['news_number'];
$from = ($page-1) * $custom_limit;

$string = preg_replace("#from=\"([0-9]+)\"#i","from=\"{$from}\"",$_SESSION['custom_'.$id]['string']);
echo custom_print(array("",$string));
require_once ENGINE_DIR."/modules/custom_navigation.php";
?>

<?PHP
/*
 Автор: Sander
 http://sandev.pro/
*/
if(!defined('DATALIFEENGINE'))die("Hacking attempt!");
if($_SESSION['custom_'.$id]){
	if(!$page) $page = 1;
	$spred = 3;
	if(!$_SESSION['custom_'.$id]['count_all']){
		if( preg_match( "#limit=['\"](.+?)['\"]#i", $_SESSION['custom_'.$id]['string'], $match ) ) $custom_limit = intval($match[1]);
		else $custom_limit = $config['news_number'];
		$count_all = $db->super_query("SELECT count(*) as c FROM ".PREFIX."_post p LEFT JOIN ".PREFIX."_post_extras e ON p.id=e.news_id WHERE ".$_SESSION['custom_'.$id]['where']);
		$count_all = ceil($count_all['c']/$custom_limit);
		$_SESSION['custom_'.$id]['count_all'] = $count_all;
	}else $count_all = $_SESSION['custom_'.$id]['count_all'];
	if ($page != 1) $pervpage = "<a href=\"#\" title=\"В начало\" onclick=\"custom_navigation('{$id}',1);return false;\"><<</a><a href=\"#\" title=\"Назад\" onclick=\"custom_navigation('{$id}',".($page - 1).");return false;\"><</a>"; 
	else $pervpage = "<span><<</span><span><</span>";
	if ($page != $count_all) $nextpage = "<a href=\"#\" title=\"Вперед\" onclick=\"custom_navigation('{$id}',".($page + 1).");return false;\">></a><a href=\"#\" title=\"В конец\" onclick=\"custom_navigation('{$id}',{$count_all});return false;\">>></a>"; 
	else $nextpage = "<span>></span><span>>></span>";
	if($page-$spred>1) $pervpage .= "<span class=\"nav_ext\">...</span>";
	if($page+$spred<$count_all) $nextpage = "<span class=\"nav_ext\">...</span>".$nextpage;
	$sidepage = array();
	for($i=$spred;$i>0;$i--) if(($page - $i)>0) $sidepage[] = "<a href=\"#\" onclick=\"custom_navigation('{$id}',".($page - $i).");return false;\">".($page - $i)."</a>"; 
	$sidepage[] = "<span>{$page}</span>";
	for($i=1;$i<=$spred;$i++) if(($page+$i)<=$count_all) $sidepage[] = "<a href=\"#\" onclick=\"custom_navigation('{$id}',".($page + $i).");return false;\">".($page + $i)."</a>";

	echo "<div class=\"navigation\">".$pervpage.implode("",$sidepage).$nextpage."</div>";
}
?>