$reply_count = dbcount("(thread_id)", DB_POSTS, "thread_id='".$tdata['thread_id']."'");		

$rstart = ($reply_count > 20 ? "rowstart=".((ceil($reply_count / 20)-1)*20)."&" : "");	

$threadsubject = "<a href='viewthread.php?".$rstart."forum_id=".$tdata['forum_id']."&thread_id=".$tdata['thread_id']."#post_".$tdata['post_id']."'>".$tdata['thread_subject']."</a>";