-my $action = $cgi->param('action') || '';
-my $course_id = $cgi->param('course_id') || '';
-my $barcode = $cgi->param('barcode') || '';
-my $return = $cgi->param('return') || '';
+my $action = $cgi->param('action') || '';
+my $course_id = $cgi->param('course_id') || '';
+my $barcode = $cgi->param('barcode') || '';
+my $return = $cgi->param('return') || '';
+my $itemnumber = ($cgi->param('itemnumber') && $action eq 'lookup') ? $cgi->param('itemnumber') : '';