--- loncom/homework/functionplotresponse.pm	2011/10/14 00:40:24	1.66
+++ loncom/homework/functionplotresponse.pm	2011/10/19 00:20:28	1.67
@@ -1,7 +1,7 @@
 # LearningOnline Network with CAPA
 # option list style responses
 #
-# $Id: functionplotresponse.pm,v 1.66 2011/10/14 00:40:24 www Exp $
+# $Id: functionplotresponse.pm,v 1.67 2011/10/19 00:20:28 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -973,6 +973,7 @@ sub compare_rel {
 
 sub addlog {
    my ($text)=@_;
+   $text=~s/\'/\\\'/g;
    $Apache::functionplotresponse::ruleslog.=$text.'<br />';
 }