--- loncom/homework/imageresponse.pm	2005/01/31 23:09:29	1.58.2.2
+++ loncom/homework/imageresponse.pm	2005/01/31 23:09:55	1.61
@@ -2,7 +2,7 @@
 # The LearningOnline Network with CAPA
 # image click response style
 #
-# $Id: imageresponse.pm,v 1.58.2.2 2005/01/31 23:09:29 albertel Exp $
+# $Id: imageresponse.pm,v 1.61 2005/01/31 23:09:55 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -344,7 +344,10 @@ sub start_foil {
     if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
 	$target eq 'analyze') {
 	my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
-	if ($name eq '') { $name=$Apache::lonxml::curdepth; }
+	if (!$name) {
+	    &Apache::lonxml::error("Foils without names exist. This can cause problems to malfunction.");
+	    $name=$Apache::lonxml::curdepth;
+	}
 	if (defined($Apache::response::foilnames{$name})) {
 	    &Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
 	}