diff --git a/src/www/minibar/about.html b/src/www/minibar/about.html
index c8c73e095..4730953c6 100644
--- a/src/www/minibar/about.html
+++ b/src/www/minibar/about.html
@@ -228,14 +228,14 @@ Some implementation details:
       trees without function names. Click again to add function names.
   <li>[Added 2013-03-27] Click on a linearization to obtain a table with all
       variants and forms. Click again to hide the table.
-  <li>[Added 2013-03-28] Abstract syntax tree visualizations: click once to
-      show abstract syntax trees without function names. Click again to add
-      function names.
+  <li>[Added 2013-04-02] Abstract syntax tree visualizations: click once to
+      show abstract syntax trees without category names. Click again to add
+      category names.
 </ul>
 
 <hr>
 <div class=modtime><small>
-<!-- hhmts start -->Last modified: Thu Mar 28 16:56:32 CET 2013 <!-- hhmts end -->
+<!-- hhmts start -->Last modified: Tue Apr  2 13:55:59 CEST 2013 <!-- hhmts end -->
 </small></div>
 <address>
 <a href="http://www.cse.chalmers.se/~hallgren/">TH</a>
diff --git a/src/www/minibar/minibar_translations.js b/src/www/minibar/minibar_translations.js
index 1ad9d6c44..370ef90df 100644
--- a/src/www/minibar/minibar_translations.js
+++ b/src/www/minibar/minibar_translations.js
@@ -213,22 +213,22 @@ Translations.prototype.show_groupedtranslations=function(translationsResult) {
 }
 
 
-function tree_button(img_url) {
-  var imgs=[tree_icon,img_url+"&nofun=true",img_url]
-  var current=0;
-  function cycle() {
-      current++;
-      if(current>=imgs.length) current=0;
-      i.src=imgs[current]
-  }
-  var i=button_img(tree_icon,cycle);
-  return i
+function tree_button(img_url,opt) {
+    var imgs=[tree_icon,img_url+(opt||"&nofun=true"),img_url]
+    var current=0;
+    function cycle() {
+	current++;
+	if(current>=imgs.length) current=0;
+	i.src=imgs[current]
+    }
+    var i=button_img(tree_icon,cycle);
+    return i
 }
 
 Translations.prototype.abstree_button=function(abs) {
   var f=this.options.tree_img_format;
   var img=this.server.current_grammar_url+"?command=abstrtree&format="+f+"&tree="+encodeURIComponent(abs)
-  var btn=tree_button(img);
+    var btn=tree_button(img,"&nocat=true");
   btn.title="Click to display abstract syntax tree"
   return btn
 }