+my $usernum = $curuser->usernum;
+# like eval(qq("$url")) but with fewer things that can go wrong
+# and if $custnum isn't mentioned, assume it goes at the end
+$url =~ s/\$custnum/$custnum/ or $url .= $custnum;
+$url =~ s/\$agentnum/$agentnum/;
+$url =~ s/\$usernum/$usernum/;
+
+#warn $url;