changed ann default image name

app/controllers/announcements_controller.rb

@@ -81,7 +81,7 @@ class AnnouncementsController < ApplicationController
         "postdate" => a.postdate,
         "author" => author,
         "link_to_show" => OrbitHelper.widget_item_url(a.to_param),
-        "img_src" => a.image.thumb.url || "http://placehold.it/100x100",
+        "img_src" => a.image.thumb.url || "/assets/announcement-default.jpg",
         "img_description" => a.image_description
       }
     end