Index: branches/5.1.x/admin_templates/articles/articles_edit.tpl
===================================================================
diff -u -N -r13096 -r13460
--- branches/5.1.x/admin_templates/articles/articles_edit.tpl	(.../articles_edit.tpl)	(revision 13096)
+++ branches/5.1.x/admin_templates/articles/articles_edit.tpl	(.../articles_edit.tpl)	(revision 13460)
@@ -135,9 +135,9 @@
 
 <script type="text/javascript">
 	$(document).ready(reflect_filename);
+	disable_categories('<inp2:n_InputName name="CategoryId"/>', <inp2:n_AllowedCategoriesJSON/>);
 
-	function reflect_filename()
-    {
+	function reflect_filename() {
     	var $checked = document.getElementById('_cb_<inp2:n_InputName field="AutomaticFilename"/>').checked;
     	document.getElementById('<inp2:n_InputName field="Filename"/>').readOnly = $checked;
     }