--- trunk/marc_sf.pm	2003/10/29 23:19:58	139
+++ trunk/marc_sf.pm	2003/11/23 15:39:23	169
@@ -4,8 +4,8 @@
 # e.g. marc_sf($row,'700','a')
 #
 sub marc_sf {
-	my $marc = shift @_;
-	my $f = shift @_;
+	my $marc = shift @_ || die "marc_sf: needs record";
+	my $f = shift @_ || die "marc_sf: needs field name";
 	my $s = shift @_;
 
 	my $i = shift @_ || 0;