ORBER BY

SELECT urls.id,incoming,outgoing,outgoingtype,COUNT( ip ) as unique, SUM (visits) as hits
					FROM urls
					LEFT OUTER JOIN visits ON site = urls.id
						GROUP BY urls.id, incoming,outgoing,outgoingtype
							ORDER BY ".$_GET['sort']." ".$_GET['by'];

SELECT urls.id,incoming,outgoing,outgoingtype,COUNT( ip ) as unique, SUM (visits) as hits
					FROM urls
					LEFT OUTER JOIN visits ON site = urls.id
						GROUP BY urls.id, incoming,outgoing,outgoingtype
							ORDER BY ".$_GET['sort']." ".$_GET['by'];