automatically identify ad type

app/views/advertisements/_form.html.erb

@@ -1,7 +1,6 @@
 <%= simple_form_for @advertisement, :html => {:multipart => true} do |f| %>
   <%= f.input :file, :as => :file %>
-  <%= f.input :referral_url %>
-  <%= f.input :ad_type, :collection => %w(vertical horizontal) %>
+  <%= f.input :referral_url, :as => :string %>
   <%= f.input :status, :collection => %w(active inactive) %>
-  <%= f.button :submit %>
+  <%= f.button :submit, "Submit" %>
 <% end %>

app/views/advertisements/_secondary_links.html.erb

@@ -1,4 +1,4 @@
-<% content_for(:secondary_nav_links) do %>
+<% content_for(:secondary_links) do %>
   <menu id="secondary-links">
     <li><%= link_to "Listing", advertisements_path %></li>
     <li><%= link_to "New", new_advertisement_path %></li>