diff --git a/kit/category-bestand.php b/kit/category-bestand.php
index e6a793f..c71d1aa 100644
--- a/kit/category-bestand.php
+++ b/kit/category-bestand.php
@@ -3,27 +3,21 @@
 Template Name: Bestand
 */
 
-get_header();
-
-
-  $numberofusers = $wpdb->get_results( "
-  SELECT post_title
-  FROM {$wpdb->posts}
-  WHERE post_type = 'post' and post_status = 'publish'
-  ORDER BY post_title ASC" );
-  //echo '<pre>'; print_r($numberofusers); echo '</pre>';
+  get_header();
 
+  $categories = get_the_category();
   $args = array(
       'cat'     =>  $categories[0]->cat_ID,
       'orderby' => 'title',
       'order'   => 'ASC',
+      'nopaging' => true,
   );
   $query = new WP_Query( $args );
   $available_chars = [];
   if ( $query->have_posts() ) {
     while ( $query->have_posts() ) :
       $query->the_post();
-      array_push($available_chars, substr(get_the_title(),0,1));
+      array_push($available_chars, mb_substr(get_the_title(),0,1,"utf-8"));
     endwhile;
     wp_reset_postdata();
   };
@@ -35,10 +29,11 @@ get_header();
   <section class="background-color-white category">
     <div class="content-wrap">
       <h2>
-        <?php $categories = get_the_category();
-        if ( ! empty( $categories ) ) {
-            echo esc_html( $categories[0]->name );
-        } ?>
+        <?php
+          if ( ! empty( $categories ) ) {
+              echo esc_html( $categories[0]->name );
+          }
+        ?>
       </h2>
 
       <p>
@@ -66,28 +61,28 @@ get_header();
         <div id="c139" class="frame frame-default frame-type-list frame-layout-0">
           <div class="tx-indexedsearch">
             <div class="tx-indexedsearch-searchbox">
-              <form method="get" role="search" action="<?php echo site_url(‘/’); ?>">
-                <fieldset>
-                  <div class="tx-indexedsearch-form">
-                    <label for="tx-indexedsearch-searchbox-sword"><?php _e('Ergebnisse filtern', 'kit'); ?>:</label>
-                    <div>
-                      <ul class="catFilter">
-                        <li class='available active'><a href=#>Alle</a></li>
-                        <?php
-                        $chars = array("0-9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "Ä", "Ü", "Ö", "ß");
-                        foreach($chars as $item) {
-                          if (in_array($item, $available_chars)) {
-                            echo "<li class='available'><a href=#>".$item."</a></li>";
-                          } else {
-                            echo "<li>".$item."</li>";
-                          };
+              <fieldset>
+                <div class="tx-indexedsearch-form">
+                  <label for="tx-indexedsearch-searchbox-sword">
+                    <?php _e('Ergebnisse filtern', 'kit'); ?>:
+                  </label>
+                  <div>
+                    <ul class="catFilter">
+                      <li class='available active'><a href=#>Alle</a></li>
+                      <?php
+                      $chars = array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "Ä", "Ü", "Ö");
+                      foreach($chars as $item) {
+                        if (in_array($item, $available_chars)) {
+                          echo "<li class='available'><a href=#>".$item."</a></li>";
+                        } else {
+                          echo "<li>".$item."</li>";
                         };
-                        ?>
-                      </ul>
-                    </div>
+                      };
+                      ?>
+                    </ul>
                   </div>
-                </fieldset>
-              </form>
+                </div>
+              </fieldset>
             </div>
           </div>
         </div>
@@ -109,7 +104,7 @@ get_header();
           while ( $query->have_posts() ) :
 
             $query->the_post();
-            $first_char = substr( esc_html( get_the_title() ) ,0,1 );
+            $first_char = mb_substr( esc_html( get_the_title() ) ,0,1,"utf-8" );
 
             if ($last_first_char === $first_char) {
               echo '<li>
diff --git a/kit/js/custom.js b/kit/js/custom.js
index d4f7d9c..aac59ca 100644
--- a/kit/js/custom.js
+++ b/kit/js/custom.js
@@ -1,6 +1,24 @@
 document.addEventListener("DOMContentLoaded", function() {
   $("ul.catFilter li.available").on("click", function(e){
+    
     e.preventDefault();
-    console.log("test");
+
+    var catFilter = document.getElementsByClassName("catFilter")[0];
+    var catElement = catFilter.querySelector('.active');
+    catElement.classList.remove('active');
+    this.classList.add('active');
+
+
+    var requestLetter = $(this).find('a:first').text().trim();
+    var lists = document.getElementsByClassName("bestandliste");
+    for (let list of lists) {
+      var listLetter = list.id;
+      if (listLetter != requestLetter && requestLetter != "Alle") {
+        list.style.display = "none";
+      } else {
+        list.style.display = "block";
+      };
+    }
+
   });
 });