public function prev_link($text = null, $default = '', $attrs = array())
{
if (is_null($text)) {
$text = $this->next;
}
$pages = ceil($this->count / $this->perpage);
if ($this->page < $pages) {
$page = $this->page + 1;
return $this->link($text, array_merge(array('href' => $this->url . '/' . $page), $attrs));
}
return $default;
}