+if ( $cgi->param('refnum') && $cgi->param('refnum') =~ /^(\d+)$/ ) {
+ push @search, "refnum = $1";
+ my $part_referral = qsearchs('part_referral', { 'refnum' => $1 } );
+ die "unknown refnum $1" unless $part_referral;
+ $title = $part_referral->referral. " $title";
+}
+
+if ( $cgi->param('cust_classnum') ) {
+ my @classnums = grep /^\d+$/, $cgi->param('cust_classnum');
+ push @search, 'cust_main.classnum IN('.join(',',@classnums).')'
+ if @classnums;
+}
+
+