Implemented a nav link generating system so that extension power what shows up in the menus rather than being hard-coded in the themes.

ext/upload/main.php

@@ -138,6 +138,21 @@ class Upload extends Extension
         $event->panel->add_block($sb);
     }
 
+
+    public function onPageNavBuilding(PageNavBuildingEvent $event)
+    {
+        $event->add_nav_link("upload",new Link('upload'), "Upload");
+    }
+
+    public function onPageSubNavBuilding(PageSubNavBuildingEvent $event)
+    {
+        if($event->parent=="upload") {
+            if (class_exists("Wiki")) {
+                $event->add_nav_link("upload_guidelines", new Link('wiki/upload_guidelines'), "Guidelines");
+            }
+        }
+    }
+
     public function onDataUpload(DataUploadEvent $event)
     {
         global $config;