attachment_fu

First at all sorry if my english is not the best

I have a problem with this plugin. It has been installed because we need
to upload images in our web. We need 3 kinds of images with different
sizes.

this is our code:

Image model:

class Image < ActiveRecord::Base
.
.
.

has_attachment :content_type => ['image/jpeg', 'image/pjpeg',
'image/gif', 'image/jpg', 'image/png'],
                              :storage => :file_system,
                              :path_prefix => 'public/images',
                              :size => 1.kilobyte..300.kilobytes,
                              :resize_to => '700>',
                              :thumbnails => { :titular1 => '220>',
:titular2 => '150>', :foro => '440>' },
                              :processor => :MiniMagick

  validates_as_attachment