Wo in der template-functions-category.php...

<?php
/*
Plugin Name: Zelig Dropdown Cats
Plugin URI: http://zeligplanet.altervista.org/2006/01/wordpress-plugin-zelig-dropdown-cats/
Description: Displays the categories in the sidebar as a simple dropdown list (select box) with the option to exclude some categories from the list.
Version: 1.4
Author: Corrado "Zelig"
Author URI: http://zeligplanet.altervista.org


--------------------------------------------------


Copyright (C) 2006 Corrado "Zelig" (email: zeligplanet AT altervista.org)


This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.


This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.


You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
The license is also available at http://www.gnu.org/copyleft/gpl.html
*/


function zelig_dropdown_cats($args = '') {
    parse_str($args, $r);
    if (!isset($r['sort_column'])) $r['sort_column'] = 'ID';
    if (!isset($r['sort_order'])) $r['sort_order'] = 'asc';
    if (!isset($r['file'])) $r['file'] = '';
    if (!isset($r['hide_empty'])) $r['hide_empty'] = 1;
    if (!isset($r['categories'])) $r['categories'] = 0;
    if (!isset($r['exclude'])) $r['exclude'] = '';
    if (!isset($r['post_count'])) $r['post_count'] = 0;
    if (!isset($r['title'])) $r['title'] = __('Categories');
    if (!isset($r['boxwidth'])) $r['boxwidth'] = 0;
    if (!isset($r['child_of'])) $r['child_of'] = -1;


    zelig_list_cats($r['sort_column'], $r['sort_order'], $r['file'], $r['hide_empty'], $r['categories'], $r['exclude'], $r['post_count'], $r['title'], $r['boxwidth'], $r['child_of']);
}


function zelig_list_cats($sort_column = 'ID', $sort_order = 'asc', $file = '', $hide_empty = 1, $categories=0, $exclude = '', $post_count = 0, $title='Categories', $boxwidth=0, $child_of=-1) {
    
    global $wpdb, $category_posts;


        if ('' == $file) {
        $file = get_settings('home') . '/';
    }


    $exclusions = '';
    if (!empty($exclude)) {
        $excats = preg_split('/[\s,]+/',$exclude);
        if (count($excats)) {
            foreach ($excats as $excat) {
                $exclusions .= ' AND cat_ID <> ' . intval($excat) . ' ';
            }
        }
    }


    if ($child_of != -1) {
        $exclusions .= ' AND category_parent ='. $child_of;
    }


    $exclusions = apply_filters('list_cats_exclusions', $exclusions);


    
    if (intval($categories)==0){
        $sort_column = 'cat_'.$sort_column;


        $query  = "
            SELECT cat_ID, cat_name, category_nicename, category_description, category_parent, category_count
            FROM $wpdb->categories
            WHERE cat_ID > 0 $exclusions
            ORDER BY $sort_column $sort_order";


        $categories = $wpdb->get_results($query);
    }
    if (!count($category_posts)) {
        $now = current_time('mysql', 1);
        $cat_counts = $wpdb->get_results("    SELECT cat_ID,
        COUNT($wpdb->post2cat.post_id) AS cat_count
        FROM $wpdb->categories 
        INNER JOIN $wpdb->post2cat ON (cat_ID = category_id)
        INNER JOIN $wpdb->posts ON (ID = post_id)
        WHERE post_status = 'publish'
        AND post_date_gmt < '$now' $exclusions
        GROUP BY category_id");
        if (! empty($cat_counts)) {
            foreach ($cat_counts as $cat_count) {
                if (1 != intval($hide_empty) || $cat_count > 0) {
                    $category_posts["$cat_count->cat_ID"] = $cat_count->cat_count;
                }
            }
        }
    }
    
    $num_found=0;
    $thelist = "";
    $rand = rand();


    if($boxwidth == 0) {
        $boxlimit = '>';    
    } else {
        $boxlimit = ' style="width:' . $boxwidth . 'px">';
    }
    
    $thelist .= '<form id="catform' . $rand . '" action="">' . "\n";
    $thelist .= '<p><select name="archive_chrono" onchange="window.location=(document.forms.catform' . $rand . '.archive_chrono[document.forms.catform' . $rand . '.archive_chrono.selectedIndex].value);"' . $boxlimit . "\n";
    if ( $title )
        $thelist .= '<option value="">' . $title . '</option>' . "\n";
        
    foreach ($categories as $category) {
        if (intval($hide_empty) == 0 || isset($category_posts["$category->cat_ID"])) {
            $num_found++;
            $link = '"'.get_category_link($category->cat_ID).'"';
            $link .= '>';
            $link .= apply_filters('list_cats', $category->cat_name, $category);
            if ( intval($post_count) == 1 )
                $link .= ' ('.intval($category->category_count).')';


            $thelist .= "\t<option value=$link</option>\n";
            }
    }
    
    $thelist .= '</select></p>' . "\n";
    $thelist .= '</form>' . "\n";
    
    echo apply_filters('list_cats', $thelist);
}
?>

function zelig_dropdown_cats($args = '') {
    parse_str($args, $r);
    if (!isset($r['sort_column'])) $r['sort_column'] = 'ID';
    if (!isset($r['sort_order'])) $r['sort_order'] = 'asc';
    if (!isset($r['file'])) $r['file'] = '';
    if (!isset($r['hide_empty'])) $r['hide_empty'] = 1;
    if (!isset($r['categories'])) $r['categories'] = 0;
    if (!isset($r['exclude'])) $r['exclude'] = '';
    if (!isset($r['post_count'])) $r['post_count'] = 0;
    if (!isset($r['title'])) $r['title'] = __('Categories');
    if (!isset($r['boxwidth'])) $r['boxwidth'] = 0;
    if (!isset($r['child_of'])) $r['child_of'] = -1;