wordpress - function to display posts from a category group by year

Question

I work with a function (from a plugin) to display post from a category category group by year, but I can´t filter to category. I try add " $posts = query_posts($query_string . '&cat=3');" but I got all categories. How can I do it? The function:

function favrik_recent_posts($args = '') {
global $wp_locale, $wpdb;

// params fun
parse_str($args, $r);
$defaults = array('group' => '1', 'limit' => '10', 'before' => '<li>', 'after' => '</li>', 'show_post_count' => false, 'show_post_date' => true, 'date' =>  'Y', 'order_by' => 'post_date DESC');
$r = array_merge($defaults, $r);
extract($r);

// output 
$output    = '';
$pre       = '';
$full_date = '';
$year      = '';
$month     = '';

// the query
$where = apply_filters('getarchives_where', "WHERE post_type = 'post' AND post_status = 'publish'");
$join  = apply_filters('getarchives_join', "");
    $qry   = "SELECT ID, post_date, post_title, post_name
              FROM $wpdb->posts $join
              $where ORDER BY $order_by LIMIT $limit";
$arcresults = $wpdb->get_results($qry);



if ($arcresults) {
    foreach ($arcresults as $arcresult) {
        if ($arcresult->post_date != '0000-00-00 00:00:00') {
            $url  = get_permalink($arcresult);
            if ($group == 0) { // dates at the side of the post link
                $arc_date = date($date, strtotime($arcresult->post_date));
                $full_date = '<em class="date">' . $arc_date . '</em> ';
            }
            if ($group == 1) { // grouping by year then month-day
                $y = date('Y', strtotime($arcresult->post_date));
                if ($year != $y)  {
                    $year = $y;
                    $pre = '<li class="year">' . $year . '</li>';
                }
                /*
                $m = date('F Y', strtotime($arcresult->post_date));
                if ($month != $m) {
                    $month = $m;
                    $pre .= '<li class="month">' . substr($month, 0, -4) . '</li>';
                } 
                */
            }
            $text = strip_tags(apply_filters('the_title', $arcresult->post_title));
            $output .= get_archives_link($url, $text, $format, 
                                          $pre . $before . $full_date, 
                                         $after);
            $pre = ''; $full_date = '';
        }
    }
}
echo $output;

}

?>