Top Authors by Post Count Listed in Two Columns - WordPress

<div class="widget">
        <h4>Top Contributers to Entries</h4>
        <?php
        function top_authors_list($number = 10) {
          $u = array();
          $authors = get_users_of_blog();
          if ($authors) {
            foreach ($authors as $author) {
              $post_count = get_usernumposts($author->user_id);
              $u[$author->user_id] = $post_count;
            }
            arsort($u);
            $i = 0;
            echo '<div class="bg">';
            echo '<ul class="column" style="float:left;margin-right: 56px;">' . "\n";
            foreach ($u as $key => $value) {
              $i++;
              if ($i <= $number) {
                $user = get_userdata($key);
                $author_posts_url = get_author_posts_url($key);
                $post_count = $value;
                if ($post_count > 0) {
                  echo '<li><a href="' . $author_posts_url .'"><span class="category-list-item">' . $user->display_name . '</span> <span class="menu-count">' . $post_count . '</span></a></li>' . "\n";
                }
              }
            }
            echo '</ul></div>';
          }
        }
        ?>
        <?php if (function_exists('top_authors_list')) top_authors_list(10); ?>
        <script type="text/javascript">
        jQuery('document').ready(function($) {
          var i = 0;
          var $newUL;
          var $theColumn = $('.column');
          var length = $theColumn.children('li').length;
          while(length > 3) { /* when enough members merits it, change this and others to 15 */
            $newUL = $('<ul class="' + $theColumn.attr('class') + '" style="float:left;"></ul>');
            while(i < 3) {
                $theColumn.children('li').eq(3).appendTo($newUL)
                i++;
                length--;
            }
            $('.bg').append($newUL);
            i = 0;
          }
        });
        </script>
    </div><!--/top contributors-->