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												// include function files for this application				require_once('book_sc_fns.php'); 				session_start();								do_html_header('Edit book details');				if (check_admin_user())				{				  if ($book = get_book_details($HTTP_GET_VARS['isbn']))				  {				    display_book_form($book);				  }				  else				    echo 'Could not retrieve book details.';				  do_html_url('admin.php', 'Back to administration menu');				}				else				  echo 'You are not authorized to enter the administration area.';								do_html_footer();								?>