phpcms手机内容页面添加上一篇和下一篇

if(!$r || $r['status'] != 99) showmessage(L('info_does_not_exists'),'blank');

 //上一页
 $previous_page = $this->db->get_one("`catid` = '$catid' AND `id`<'$id' AND `status`=99",'*','id DESC');
 //下一页
 $next_page = $this->db->get_one("`catid`= '$catid' AND `id`>'$id' AND `status`=99");
 if(empty($previous_page)) {
                            $previous_page = array('title'=>L('first_page'), 'thumb'=>IMG_PATH.'nopic_small.gif', 'url'=>'javascript：alert(\''.L('first_page').'\');');
                    }
                    if(empty($next_page)) {
                            $next_page = array('title'=>L('last_page'), 'thumb'=>IMG_PATH.'nopic_small.gif', 'url'=>'javascript：alert(\''.L('last_page').'\');');
                    }

< a href="{WAP_SITEURL}&a=show&catid={$catid}&typeid=1&id={$previous_page[id]}" >{$previous_page[title]}</a>

<a href="{WAP_SITEURL}&a=show&catid={$catid}&typeid=1&id={$next_page[id]}" >{$next_page[title]}</a>