% if ( $cgi->param('referral_custnum') ) {
% $cgi->param('referral_custnum') =~ /^(\d+)$/
% or errorpage(emt("Illegal referral_custnum"));
% if ( $cgi->param('referral_custnum') ) {
% $cgi->param('referral_custnum') =~ /^(\d+)$/
% or errorpage(emt("Illegal referral_custnum"));