structure.css -> default.css

Themes are optional, a theme overrides style in default.css

app/views/admin/designs/_form.html.erb

@@ -26,11 +26,11 @@
 <% end %> 
 </p>
 <p>
-<%= f.label "structure_css", t('admin.structure_css') %>
-<%  if @design.structure_css.blank? %>
-    <%= f.file_field :structure_css %>
+<%= f.label "default_css", t('admin.default_css') %>
+<%  if @design.default_css.blank? %>
+    <%= f.file_field :default_css %>
   <% else%>
-    <%= File.basename (@design.structure_css.url)  %>
+    <%= File.basename (@design.default_css.url)  %>
 <% end %> 
 </p>
 <p>

app/views/admin/pages/_form.html.erb

@@ -27,7 +27,7 @@
 	<% if @design %>
 		<%= f.select :theme_id, @design.themes.collect { |t| [t.name.capitalize, t.id] }%>
 	<% else %>
-		<%= f.select :theme_id, @default_design.themes.collect { |t| [t.name.capitalize, t.id] }, :selected => @default_theme.id %>
+		<%= f.select :theme_id, @default_design.themes.collect { |t| [t.name.capitalize, t.id] }, :include_blank => true %>
 	<% end %>
 </p>
 

app/views/admin/pages/_themes_ddl.html.erb

@@ -0,0 +1,2 @@
+<option></option>
+<%= options_from_collection_for_select(@themes, :id, :name) %>

app/views/admin/pages/reload_themes.js.erb

@@ -1 +1 @@
-$('#page_theme_id').html("<%= escape_javascript(options_from_collection_for_select(@themes, :id, :name, @default_theme.id )) %>");
+$('#page_theme_id').html("<%= escape_javascript(render :partial => 'admin/pages/themes_ddl') %>");