Navigation anpassen

<?php
/*
Plugin Name: Display SubMenue
Plugin URI: http://arno-simon.de/wordpress/navigation-haupt-subebene/
Description: Displays all static Pages associated to one TopLevel-Page
Version: 1.3
Author: Arno Simon
Author URI: http://arno-simon.de/
*/
/*
  Installation: Place the pluginfile to the folder /wp-content/plugin
    or a subfulder of your choice. Activate the plugin via the site-
    admin-pannel "Plugins".
  Add
   <?php if(function_exists('as_DisplaySubMenu')) as_DisplaySubMenu(); ?>
  after the line containing the wp_list_pages-call. Add argument '&depth=1'
  to the wp_list_pages-call mentioned above.
  If there's any problem about using this plugin let me know it.
  
  ChangeLog: 
    1.0  first public version
    1.1b recoded code to exclude several pagetypes
    1.2  There had been a Bug determining the count of local_subpages
         so I tried to display a submenu where nothin had been.
    1.3  When a graphic is user as titlebackground, long titles skips
         out of the frame advised by the graphic-spacings. As quick fix
         the default-value for $title has been skipped and added 8 parameters:
         
           $text4pagetitle ... if this string is set it will be used as 
                               replacement for the real pagetitle of the 
                               main-submenu-page entered to the database
           $text_before    ... will be added in front of $text4pagetitle
                               can contain text only or html also
           $text_ater      ... will be added after $text4pagetitle
                               can contain text only or html also
           $html_before    ... contains the html-Tag (standard <h2>)
                               added in front of the title
           $html_after     ... contains the html-Tag (standard </h2>)
                               added at the end of title
           $useDivisor     ... Determines to use the divisor.
                               everything besides of '' activates the divisor
           $Divisor        ... integer value representing the charcount to
                               calculate the linecount of the headline
           $sort_column    ... to order the Menu by your own wishes
                               Standard value -> menu_order
         
         Rebuild the parameter-section so all parameters could be givven
         as $args in the format of url-parameters:
           as_displaySubMneu("title='Untermenu'&text_before='('&text_after=')'");
*/
function as_DisplaySubMenu( $args = '' )
{
 // extract the parameters out of $args
 parse_str($args, $do);
 // check if all params are givven
 if(!isset($do[title]))          $do[title]          = '';
 if(!isset($do[text_before]))    $do[text_before]    = '';
 if(!isset($do[text_after]))     $do[text_after]     = ''; 
 if(!isset($do[text4pagetitle])) $do[text4pagetitle] = '';
 if(!isset($do[useDivisor]))     $do[useDivisor]     = '';
 if(!isset($do[useLocalTitle]))  $do[useLocalTitle]  = 'Yes';
 if(!isset($do[divisor]))        $do[divisor]        = 0;
 if(!isset($do[html_before]))    $do[html_before]    = '<h2>';
 if(!isset($do[html_after]))     $do[html_after]     = '</h2>';
 if(!isset($do[sort_column]))    $do[sort_column]    = 'menu_order';
 // get the parameters as regular vars
 foreach($do as $key => $value)
 { 
  $$key = $value;
 }
 if(!(    is_category() || is_day()
       || is_month()    || is_year()
       || is_search()
       || (     isset($_GET['paged'])
            && !empty($_GET['paged'])
          )
       || isset($_GET['s'])
     )
   ) 
  {
  global $wpdb;
  global $wp_query;
  $local_act_object = $wp_query->get_queried_object();
  $local_act_pageid = $local_act_object->ID;
  $local_prv_page_found = 'Z';
  while($local_prv_page_found != 'X') {
   $local_prv_pageid = $wpdb->get_var("SELECT post_parent "
         ."FROM $wpdb->posts WHERE ID = '$local_act_pageid'");
   if(    isset($local_prv_pageid)
       && $local_prv_pageid != null
       && $local_prv_pageid != 0) {
    $local_prv_parent = $wpdb->get_var("SELECT post_parent "
         ."FROM $wpdb->posts WHERE ID = '$local_prv_pageid'");
    if(isset($local_prv_parent) && $local_prv_parent != null) {
     if($local_prv_parent == 0) {
      $local_act_pageid = $local_prv_pageid;
      $local_prv_page_found = 'X';
     } else {
      $local_act_pageid = $local_prv_parent;
     }
    } elseif( $local_prv_parent == null ) {
     $local_act_pageid = $local_prv_pageid;
     $local_prv_page_found = 'X';
    }
   } else {
    $local_prv_page_found = 'X';
   }
  }
  if(isset($local_act_pageid) && !empty($local_act_pageid)) {
  $local_pageid = $local_act_pageid;
  $local_title = $wpdb->get_var("SELECT post_title FROM "
             ."$wpdb->posts WHERE ID = '$local_pageid'");
  $local_subpages = $wpdb->query("SELECT ID FROM "
        ."$wpdb->posts WHERE post_parent = '$local_pageid'");
  if($text4pagetitle != '') 
   $local_mentitle = $html_before.$title.$text_before.$text4pagetitle.$text_after.$html_after;
  elseif($useLocalTitle == 'Yes')
   $local_mentitle = $html_before.$title.$text_before.$local_title.$text_after.$html_after;
  else
   $local_mentitle = '';
  if($useDivisor != '' && $divisor > 0)
  {
   $lines = round(strlen($local_mentitle) / $divisor);
  }
  if(isset($local_subpages)) {
   if(!empty($local_subpages) || $local_subpages>0) {
    if($useDivisor != '')
    {
     ob_start();
     wp_list_pages('sort_column='.$sort_column.'&title_li='.$html_before
      .$local_mentitle.$html_after.'&depth=0&child_of='.$local_pageid);
     $page_list = ob_get_contents();
     ob_end_clean();
     if($lines > 1)
     {
      $page_list = str_replace('pagenav', 'pagenav'.$lines, $page_list);
     }
     echo $page_list;
    }
    else
    wp_list_pages('sort_column='.$sort_column.'&title_li='.$local_mentitle
                  .'&depth=0&child_of='.$local_pageid);
   }
  }
  }
 } 
}
?>