[Princeton]

I like it ... good job.

Some quick fixes..

define('NO_REGISTER_GLOBALS', 1);
define('GET_EDIT_TEMPLATES', true);

// pre-cache templates used by all actions
$globaltemplates = array(
	'HELPDESK_SHELL',
	'HELPDESK',
	'helpdesk_ticket',
	'helpdesk_ticketlist',
);

// pre-cache templates used by specific actions
$actiontemplates = array(
	'newticket' => array(
		'helpdesk_newticket',
	),
	'mytickets' => array(
		'helpdesk_message',
	),
	'newreplies' => array(
		'helpdesk_message',
	),
	'ticket' => array(
		'helpdesk_quickreply',
		'helpdesk_reply',
	),
);

Suggestions:

pagenav
search facility