Dedecms で使用される重量ソート方法が機能しない場合はどうすればよいですか?

if ( $isweight=='y')

$orderWeight = list_sort_by($orderWeight,'weight', 'asc');

SELECT arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,tp.namerule, tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath 
FROM `dede_archives` arc LEFT JOIN `dede_arctype` tp ON arc.typeid=tp.id WHERE arc.typeid IN (29) AND 
arc.arcrank > -1 ORDER BY arc.sortrank DESC

{dede:arclist orderby='weight' typeid='29' isweight='y' 
limit='4,1' titlelen='100' infolen='100' }

else if($orderby =='weight') $ordersql = " order by arc.weight asc";

{dede:list pagesize=&#39;10&#39; titlelen=&#39;50&#39; orderby=&#39;weight&#39;} ?[field:textlink/]<br/> {/dede:list}

else if($orderby=="lastpost") {

else if($orderby=="weight") { $ordersql = " order by arc.weight $orderWay"; }

if(ereg('hot|click|lastpost',$orderby))

if(ereg('hot|click|weight|lastpost',$orderby))

{dede:arclist row=&#39;10&#39; titlelen=&#39;50&#39; orderby=&#39;weight&#39;} ?[field:textlink/]<br/> {/dede:arclist}