织梦下载频道download.php防盗链怎么做

$row = $dsql->GetOne("Select $vname From ".$cu->ChannelInfos['addtable']." where aid='$aid'");

if(!strstr($_SERVER['HTTP_REFERER'],$arcurl))
{
echo "<script language='javascript'>location=\&;$arcurl\&;;</script>";
}