+#false laziness w/process/cust_main.cgi
+my @invoicing_list = split( /\s*\,\s*/, $cgi->param('invoicing_list') );
+push @invoicing_list, 'POST' if $cgi->param('invoicing_list_POST');
+push @invoicing_list, 'FAX' if $cgi->param('invoicing_list_FAX');
+$cgi->param('invoicing_list', join(',', @invoicing_list) );
+