--- loncom/interface/lonindexer.pm	2006/07/21 08:25:25	1.149
+++ loncom/interface/lonindexer.pm	2006/07/31 19:45:57	1.151
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Directory Indexer
 #
-# $Id: lonindexer.pm,v 1.149 2006/07/21 08:25:25 albertel Exp $
+# $Id: lonindexer.pm,v 1.151 2006/07/31 19:45:57 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1163,6 +1163,9 @@ sub coursecontext {
 
 sub showpreview {
     my ($filelink)=@_;
+    if ($filelink=~m-^(/ext/|http://)-) {
+	return &mt('External Resource, preview not enabled');
+    }
     my ($curfext)=($filelink=~/\.(\w+)$/);
     my $output='';
     my $embstyle=&Apache::loncommon::fileembstyle($curfext);