Index: app/models/attachment.rb
===================================================================
--- app/models/attachment.rb	(revision 141)
+++ app/models/attachment.rb	(working copy)
@@ -1,6 +1,6 @@
 class Attachment < ActiveRecord::Base
   
-  ATTACHMENT_DIR = "#{RADIANT_ROOT}/db/attachments"
+  ATTACHMENT_DIR = "#{RAILS_ROOT}/db/attachments"
   
   belongs_to :created_by, :class_name => 'User', :foreign_key => 'created_by'
   belongs_to :updated_by, :class_name => 'User', :foreign_key => 'updated_by'
Index: lib/attachment_tags.rb
===================================================================
--- lib/attachment_tags.rb	(revision 141)
+++ lib/attachment_tags.rb	(working copy)
@@ -119,10 +119,10 @@
     size = size.to_sym if size
     alt = tag.attr['alt']
     if link
-      url = attachment.url(transform)
-      %{<a href="#{url}"><img alt="#{alt}" src="#{attachment.public_filename(:thumbnail)}" /></a>}
+      url = attachment.url(tag.attr['transform'])
+      %{<a href="#{url}"><img alt="#{alt}" src="#{attachment.url(tag.attr['thumbnail_transform']||:thumbnail)}" /></a>}
     else
-      %{<img alt="#{alt}" src="#{attachment.public_filename(:thumbnail)}" />}
+      %{<img alt="#{alt}" src="#{attachment.url(tag.attr['thumbnail_transform']||:thumbnail)}" />}
     end
   end