rails inline attachment

do_contact.html.erb

<h2>New Message!</h2>

<p>Priority:</p>
<%=@priority%>

<p>
<%= image_tag attachments['image.jpg'].url %>
</p>
<p>
<%=@description%>
</p>

testmailer.rb

class Testmailer < ActionMailer::Base
  default :from => "[email protected]"
  
  def do_contact(subject,description,attachment,priority)
    @description = description 
    @priority    = priority
    
    if attachment
      
    attachments.inline['image.jpg'] = File.open(attachment.path, 'rb'){|f| f.read}
    end
    
    mail(:to => "[email protected]", :subject => subject)
  end
end