Rails - Sep 2009 - Getting started with Rake - how do I copy a directory of assets to RAILS_ROOT + "/public"

I am just getting started with Rake. I am trying to create a rake task
from within a rails plugin to copy some asset files (inside /assets in
my plugin folder) to my rails application /public folder.
How can I achieve this?

I am not sure whether to use FileUtils or File. Where AM I in rake
terms. No matter what I do it keeps saying it can''t find the file. Do
I need to use File.join or is there a better rake way? Any resources
out there on how to use rake for file oriented tasks like this? Should
I use a generator instead?

---
require ''ftools'' #file tools

desc "Installs famfam icons and stylesheets in application"
namespace :famfam do
  desc "famfam icons and stylesheets in application"
  task :install => :environment do
    puts "Copying famfam icons from ../assets/icons to " + RAILS_ROOT
+ "/public/styles"
    FileUtils.cd ''..''
    puts FileUtils.pwd
    puts File.dirname(__FILE__)
    File.cp "/assets/icons", RAILS_ROOT + "/public/styles"
  end
end