use the asset pipeline to generate the path to the editor.css file

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rich (1.1.0)
+    rich (1.2.0)
       jquery-rails
       kaminari
       mime-types
@@ -50,7 +50,7 @@ GEM
     jquery-rails (2.0.2)
       railties (>= 3.2.0, < 5.0)
       thor (~> 0.14)
-    json (1.6.6)
+    json (1.7.3)
     kaminari (0.13.0)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -60,7 +60,7 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.18)
-    multi_json (1.3.2)
+    multi_json (1.3.5)
     paperclip (2.7.0)
       activerecord (>= 2.3.0)
       activesupport (>= 2.3.2)
@@ -94,12 +94,12 @@ GEM
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)
-    sass (3.1.16)
+    sass (3.1.18)
     sass-rails (3.2.5)
       railties (~> 3.2.0)
       sass (>= 3.1.10)
       tilt (~> 1.3)
-    sprockets (2.1.2)
+    sprockets (2.1.3)
       hike (~> 1.2)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)

lib/rich.rb

@@ -6,7 +6,7 @@
 require "rich/engine"
 
 module Rich
- 
+
   # configure image styles
   def self.image_styles
       @@image_styles.merge({ :rich_thumb => "100x100#" })
@@ -61,7 +61,7 @@ def self.image_styles=(image_styles)
     :stylesSet  =>  [],
     :extraPlugins => 'stylesheetparser,richfile,MediaEmbed,audio',
     :removePlugins => 'scayt,menubutton,contextmenu,image,forms',
-    :contentsCss => '/assets/rich/editor.css',
+    :contentsCss => :default,
     :removeDialogTabs => 'link:advanced;link:target',
     :startupOutlineBlocks => true,
     :forcePasteAsPlainText => true,
@@ -94,7 +94,11 @@ def self.options(overrides={}, scope_type=nil, scope_id=nil)
 
     # merge in local overrides
     editor_options.merge!(overrides) if overrides
-
+
+    # if the contentcss is set to :default, use the asset pipeline
+    editor_options[:contentsCss] = ActionController::Base.helpers.stylesheet_path('rich/editor.css') if editor_options[:contentsCss] == :default
+
+
     # update the language to the currently selected locale
     editor_options[:language] = I18n.locale
 
@@ -163,11 +167,6 @@ def self.setup
   end
 
   def self.insert
-
-
-
-
-
     # manually inject into Formtastic 1. V2 is extended autmatically.
     if Object.const_defined?("Formtastic")
       if(Gem.loaded_specs["formtastic"].version.version[0,1] == "1")