diff --git a/web/CXM_making_a_web_site.anubis b/web/CXM_making_a_web_site.anubis
index 16db090..29e535f 100644
--- a/web/CXM_making_a_web_site.anubis
+++ b/web/CXM_making_a_web_site.anubis
@@ -50,7 +50,9 @@
 read tools/basis.anubis   
 read tools/printable_tree.anubis
 read tools/base64.anubis
-read tools/random.anubis
+read tools/random.anubis   
+read tools/dictionaries.anubis
+read system/lists.anubis
 read system/string.anubis
 read system/logger.anubis
 read CXM_common.anubis   
@@ -4577,14 +4579,29 @@ define Printable_tree
        [h . t] then [format(cinfo,state_name,h,is_https) 
                      . format(cinfo,state_name,t,is_https,charset)]
      }.
-     
+
+ define List(HTML_Head_Tag)
+  rebuild_html_head_tags
+  (
+    List(HTML_Head_Tag) lwf,
+    List(HTML_Head_Tag) so_far
+  ) =
+  if lwf is
+  {
+    [] then so_far,
+    [h . t] then
+      rebuild_html_head_tags(t, append_once(so_far, h))
+  }.
+  
 define Printable_tree
   _format_html_head
   (
     List(HTML_Head_Tag) lwf,
-    Printable_tree so_far
+    Printable_tree so_far,
+    Dictionary(String, Word32) js_dict
   )
   =
+    //with lwf_ = rebuild_html_head_tags(lwf, []),
     if lwf is
     {
       []        then reverse(so_far),
@@ -4592,21 +4609,31 @@ define Printable_tree
         if h is
         {
           meta(meta)        then
-            [format(meta) . _format_html_head(t, so_far)],
+            [format(meta) . _format_html_head(t, so_far, js_dict)],
           title(title)      then
-            ["<title>"+title+"</title>\n" . _format_html_head(t, so_far)],
+            ["<title>"+title+"</title>\n" . _format_html_head(t, so_far, js_dict)],
           js(jsf)           then
-            [add_js_files([jsf]) . _format_html_head(t, so_far)],
+            since jsf is js_file(filename, _),
+            if js_dict.get(filename) is
+            {
+              failure then
+                forget(js_dict.insert(filename, 0));
+                [add_js_files([jsf]) . _format_html_head(t, so_far, js_dict)],
+
+              success(_) then
+                _format_html_head(t, so_far, js_dict),
+            }
           js_inline(jsi)    then
             if jsi is
             {
-                script(type, _) then ["<script type=\"" + type + "\">"+content(jsi)+"</script>\n" . _format_html_head(t, so_far)],
+                script(type, _) then
+                  ["<script type=\"" + type + "\">"+content(jsi)+"</script>\n" . _format_html_head(t, so_far, js_dict)],
             }
           css(cssf)         then
             since cssf is css_file(file_name, media),          
-            ["<link rel=\"stylesheet\" type=\"text/css\" href=\""+file_name+"\" media=\""+to_String(media)+"\" />\n" . _format_html_head(t, so_far)],
+            ["<link rel=\"stylesheet\" type=\"text/css\" href=\""+file_name+"\" media=\""+to_String(media)+"\" />\n" . _format_html_head(t, so_far, js_dict)],
           css_inline(cssi)  then
-            ["<style>"+cssi+"</style>\n" . _format_html_head(t, so_far)]
+            ["<style>"+cssi+"</style>\n" . _format_html_head(t, so_far, js_dict)]
         }
     }
   .
@@ -4618,7 +4645,7 @@ public define Printable_tree
     String              charset
   )
   =
-  _format_html_head((List(HTML_Head_Tag))[ meta(http_equiv("content-type", "text/html; charset="+charset)) . lwf], []).
+  _format_html_head((List(HTML_Head_Tag))[ meta(http_equiv("content-type", "text/html; charset="+charset)) . lwf], [], make_dictionary((Word32)0, dictionaryComparerString)).
 
 public define Printable_tree
   format_html_head
@@ -4626,7 +4653,7 @@ public define Printable_tree
     List(HTML_Head_Tag) lwf
   )
   =
-  _format_html_head(lwf, []).
+  _format_html_head(lwf, [], make_dictionary((Word32)0, dictionaryComparerString)).
 
   
 public type HTML_ajax_content:
--
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