php页面传递参数的问题，求指教

$query = $db->findall("p_newsclass where f_id='$_GET[cid]'");while ($row = $db->fetch_array($query)) {	$news_class_in.= $row[id].",";}echo $news_class_in=$news_class_in."$_GET[cid]";

$result = mysql_query("select id from p_newsbase where cid in ($news_class_in)");$total = mysql_num_rows($result);pageft($total, 20);if ($firstcount < 0)	$firstcount = 0;$query = $db->findall("p_newsbase where cid in ($news_class_in)  limit  $firstcount, $displaypg");

$query = $db->findall("p_newsclass where f_id='$_GET[cid]'");while ($row = $db->fetch_array($query)) {	$news_class_in.= $row[id].",";}echo  $news_class_in=$news_class_in."$_GET[cid]";

{section name=l loop=$sm_list}     <div class="listtt">      <h2><a href="list.php?cid={$sm_list[l].cid}">{$sm_list[l].cidname}</a></h2>      <span><a href="view.php?id={$sm_list[l].id}">{$sm_list[l].title}</a></span>      <div id="more">{$sm_list[l].date_time}</div>    </div>    {/section}

$news_class_in = trim($news_class_in, ',');