--- /Users/Daniele/Desktop/moodle19/lib/weblib.php	2009-02-17 00:05:37.000000000 +0100
+++ /Applications/MAMP/htdocs/moodle19/lib/weblib.php	2009-02-19 17:19:22.000000000 +0100
@@ -3788,6 +3788,37 @@
                 'type' => 'home');
     }
 
+    if (!isset($CFG->hidecategorynavlink)) {
+        // use default = show
+        $CFG->hidecategorynavlink = 0;
+    }
+    if ($CFG->hidecategorynavlink == 0) {
+        // Hide from nobody
+        $showcategory = true;
+    }
+    if ($CFG->hidecategorynavlink == 1) {
+        // Hide from students
+        $showcategory = !has_capability('moodle/course:view', get_context_instance(CONTEXT_COURSE, $COURSE->id), '', false);
+    }
+    if ($CFG->hidecategorynavlink == 2) {
+        // Hide from all users
+        $showcategory = false;
+    }
+
+    if (isset($COURSE) && $showcategory) {
+       $catlinks = array();
+		if ($cattree = get_record("course_categories", "id", $COURSE->category)) {
+		    $cattype = $cattree->visible ? "category" : "hiddencategory";
+			$catlinks[] = array('name' => $cattree->name, 'link' => "category.php?id=$COURSE->category", 'type' => $cattype);
+			while ($cattree->parent) {
+				$cattree = get_record("course_categories", "id", $cattree->parent);
+			    $cattype = $cattree->visible ? "category" : "hiddencategory";
+				array_unshift($catlinks, array('name' => $cattree->name, 'link' => "category.php?id=$COURSE->category", 'type' => $cattype));
+			}
+		}
+		$navlinks = array_merge($navlinks, $catlinks);
+    }
+
     // Course name, if appropriate.
     if (isset($COURSE) && $COURSE->id != SITEID) {
         $navlinks[] = array(
@@ -3866,7 +3897,11 @@
             $navigation .= get_separator();
         }
         if ((!empty($navlink['link'])) && !$last) {
-            $navigation .= "<a onclick=\"this.target='$CFG->framename'\" href=\"{$navlink['link']}\">";
+            if ($navlink['type'] == 'hiddencategory') {
+	            $navigation .= "<a class=\"dimmed\" onclick=\"this.target='$CFG->framename'\" href=\"{$navlink['link']}\">";
+            } else {
+	            $navigation .= "<a onclick=\"this.target='$CFG->framename'\" href=\"{$navlink['link']}\">";
+            }
         }
         $navigation .= "{$navlink['name']}";
         if ((!empty($navlink['link'])) && !$last) {