--- advanced_forum.module	2009-01-28 00:31:12.000000000 +0100
+++ advanced_forum.module	2009-02-06 19:08:13.062500000 +0100
@@ -12,8 +12,11 @@
  * Implementation of hook_perm().
  */
 function advanced_forum_perm() {
-  return array('administer advanced forum',
-    'view forum statistics');
+  return array(
+    'administer advanced forum',
+    'view forum statistics',
+    'view forum selector',
+    );
 }
 
 /**
@@ -144,6 +147,31 @@ function advanced_forum_theme_registry_a
   }
 }
 
+/**
+ * Implementation of hook_form_alter().
+ */
+function advanced_forum_form_alter(&$form, $form_state, $form_id) {
+  // if forum id is passed as last arg, then hide the forum selector on the input form
+  $forumid = end(arg());
+  $forum = forum_term_load($forumid);
+
+  if ($forum && $form_id == 'forum_node_form' && !user_access('view forum selector')){
+    $form['taxonomy'][1] = array(
+      '#type' => 'hidden',
+      '#default_value' => $forumid,
+    );
+  }
+  
+  // if editing a forum node, and they don't have the relevant permissions to see the forum selector,
+  // then hide it away from them
+  if (arg(2) == 'edit' && $form_id == 'forum_node_form' && !user_access('view forum selector')){
+    $form['taxonomy'][1] = array(
+      '#type' => 'hidden',
+      '#default_value' => $form['forum_tid'],      
+    );
+  }
+}
+
 // SETTINGS PAGE *************************************************************/
 
 /**