Hintergrundgrafik hinter Kategorien?

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<li id="categories-455771091" class="widget widget_categories"><h2 class="widgettitle">THEMEN</h2>  <ul>
   <li class="cat-item cat-item-1"><a href="http://www.steinblog.steinindustrie.de/?cat=1" title="Alle unter Startseite abgelegten Artikel ansehen">Startseite</a>
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 <li class="cat-item cat-item-3"><a href="http://www.steinblog.steinindustrie.de/?cat=3" title="Alle unter GaLa-Bau abgelegten Artikel ansehen">GaLa-Bau</a>
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 <li class="cat-item cat-item-5"><a href="http://www.steinblog.steinindustrie.de/?cat=5" title="Alle unter Natursteine abgelegten Artikel ansehen">Natursteine</a>
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 <li class="cat-item cat-item-4"><a href="http://www.steinblog.steinindustrie.de/?cat=4" title="Alle unter Schotterwerke abgelegten Artikel ansehen">Schotterwerke</a>
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 <li class="cat-item cat-item-6"><a href="http://www.steinblog.steinindustrie.de/?cat=6" title="Alle unter Straßen- und Tiefbau abgelegten Artikel ansehen">Straßen- und Tiefbau</a>
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 <li class="cat-item cat-item-7"><a href="http://www.steinblog.steinindustrie.de/?cat=7" title="Alle unter Projekte abgelegten Artikel ansehen">Projekte</a>
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 <li class="cat-item cat-item-8"><a href="http://www.steinblog.steinindustrie.de/?cat=8" title="Alle unter Produkte abgelegten Artikel ansehen">Produkte</a>
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 <li class="cat-item cat-item-9"><a href="http://www.steinblog.steinindustrie.de/?cat=9" title="Alle unter Ideen und Infos abgelegten Artikel ansehen">Ideen und Infos</a>
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/**
 * Display categories widget.
 *
 * Allows multiple category widgets.
 *
 * @since 2.2.0
 *
 * @param array $args Widget arguments.
 * @param int $number Widget number.
 */
function wp_widget_categories($args, $widget_args = 1) {
 extract($args, EXTR_SKIP);
 if ( is_numeric($widget_args) )
  $widget_args = array( 'number' => $widget_args );
 $widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
 extract($widget_args, EXTR_SKIP);
 $options = get_option('widget_categories');
 if ( !isset($options[$number]) )
  return;
 $c = $options[$number]['count'] ? '1' : '0';
 $h = $options[$number]['hierarchical'] ? '1' : '0';
 $d = $options[$number]['dropdown'] ? '1' : '0';
 $title = empty($options[$number]['title']) ? __('Categories') : apply_filters('widget_title', $options[$number]['title']);
 echo $before_widget;
 echo $before_title . $title . $after_title;
 $cat_args = array('orderby' => 'name', 'show_count' => $c, 'hierarchical' => $h);
 if ( $d ) {
  $cat_args['show_option_none'] = __('Select Category');
  wp_dropdown_categories($cat_args);
?>
<script type='text/javascript'>
/* <![CDATA[ */
 var dropdown = document.getElementById("cat");
 function onCatChange() {
  if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
   location.href = "<?php echo get_option('home'); ?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
  }
 }
 dropdown.onchange = onCatChange;
/* ]]> */
</script>
<?php
 } else {
?>
  <ul>
  <?php
   $cat_args['title_li'] = '';
   wp_list_categories($cat_args);
  ?>
  </ul>
<?php
 }
 echo $after_widget;
}