//widget - top contributors
class Jquery_Top_Contributors extends WP_Widget {

    /**
     * Register widget with WordPress.
     */
    public function __construct() {
        parent::__construct(
            'jquery_top_contributors', // Base ID
            'Jquery_Top_Contributors', // Name
            array( 'description' => __( 'Display top contributorz block', 'text_domain' ), ) // Args
        );
    }

    /**
     * Front-end display of widget.
     * @see WP_Widget::widget()
     * @param array $args     Widget arguments.
     * @param array $instance Saved values from database.
     */
    public function widget( $args, $instance ) {
        extract( $args );
        $title = apply_filters( 'widget_title', $instance['title'] );

        echo $before_widget;
        if ( ! empty( $title ) )
            echo $before_title . $title . $after_title;
?><?php
function top_authors_list($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);
    $i = 0;
    echo '<div class="call-out">';
    echo '<ul id="columns">' . "\n";
    foreach ($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>
$j=jQuery.noConflict();
var cols = 2;
var container = $j('ul#columns');
var items = container.find('li');
var itemsPerCol = Math.ceil(items.length / cols);
var stack = [];
for (var i = 0; i < itemsPerCol; i++) {
    for (var k = 0; k < cols; k++) {
    stack.push(items[i + (itemsPerCol * k)]);
    }
}
items.css({
    float:'left',
    width:Math.floor(container.width() / cols)
});

container.html(stack).append($j('<br>').css({clear:'both'}));
</script>

<?php
        echo $after_widget;
    }

    /**
     * Sanitize widget form values as they are saved.
     * @see WP_Widget::update()
     * @param array $new_instance Values just sent to be saved.
     * @param array $old_instance Previously saved values from database.
     * @return array Updated safe values to be saved.
     */
    public function update( $new_instance, $old_instance ) {
        $instance = array();
        $instance['title'] = strip_tags( $new_instance['title'] );

        return $instance;
    }

    /**
     * Back-end widget form.
     * @see WP_Widget::form()
     * @param array $instance Previously saved values from database.
     */
    public function form( $instance ) {
        if ( isset( $instance[ 'title' ] ) ) {
            $title = $instance[ 'title' ];
        }
        else {
            $title = __( 'Jquery Top Contributors', 'text_domain' );
        }
        ?>
        <p>
        <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
        <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
        </p>
        <?php
    }

} // class Top_Contributors
add_action( 'widgets_init', create_function('', 'return register_widget("Jquery_Top_Contributors");') );