Stuff

		mysql_query("DELETE FROM module_comments WHERE id='$del'");

		do {
			$tmpq=mysql_query("SELECT * FROM module_comments");
		
			$arr=array();
			while($tmpd=mysql_fetch_array($tmpq,MYSQL_ASSOC)){
				$arr[]=$tmpd['id'];	
				print_r($arr);
			}			

		} while (mysql_query("DELETE FROM module_comments WHERE parent NOT IN (".implode(",", $arr).")"));