function widget_categories($args) {
extract($args);

    echo $before_widget;
    $title = __('Разделы сайта');
    if ( $title )
        echo $before_title . $title . $after_title; ?>
    <?php $all_cats = get_categories(); ?>
    <ul class="sidelist">
        <?php
            if($all_cats && is_array($all_cats)){
                $class = ' class="separ"';
                foreach($all_cats as $cat){
                    echo '
                        <li'. ($class = $class ? '' : ' class="separ"' ) .'>
                            <div>
                                <a href="'. get_category_link($cat->cat_ID).'">'.$cat->name.'</a>
                            </div>
                        </li>';
                }
            }
        ?>
    </ul>