NEW ORLEANS — Dirk Nowitzki knows a vintage Vince Carter performance when he sees it.So with a subtle nod, Nowitzki gave Carter the green light to take a crucial shot in the final seconds, and could not have been more pleased with the result.Carter capped a 22-point performance with a 3-pointer that gave Dallas the lead with 6.5 seconds left, and the Mavericks held on for their third straight victory, 104-100 over the New Orleans Hornets on Friday night.