how to send an inline attachment in ruby on rails

Hi    Can anybody give me some sample program with exact steps how can I send an inline jpeg image attachment with the email in Ruby on Rails.I tried on net but I found

inline_attachment :content_type => "image/jpeg",        :body => File.read("#{RAILS_ROOT}/public/images/bg.jpg"),         :filename=>"bg.jpg",        :cid => '<cid.bg@...>'

but I don't know where to use this code and other details.It would be Gr8 if I can get some sample program with exact steps.so that I can send an inline attachment.

thanks and regards Kishore Mukati