You should not display the ticket number right after client submit a ticket for security reason.
Google for: "Never Display The Ticket Number After Client Submit A New Ticket!"
Also, please read this: http://www.osticket.com/forums/showpost.php?p=24728&postcount=4(http://www.osticket.com/forums/showpost.php?p=24728&postcount=4).
Sincerely,
Masino Sinaga
