function centreservices_menu() {
  $items = array();

// edit a students details ,  % = person id of student
  $items['cs/student/%/edit'] = array(
    'title' => t('CentreServices'),
    'page callback' => 'centreservices_editstudent',
    'page arguments' => array(2),
   'type' =>MENU_NORMAL_ITEM
  );

}


function centreservices_editstudent($student_id=NULL) {
$output="Hello $student_id!!";
  return $output;
}