diff --git a/app/helpers/boxes_helper.rb b/app/helpers/boxes_helper.rb
index a6b64ee..4cb86c4 100644
--- a/app/helpers/boxes_helper.rb
+++ b/app/helpers/boxes_helper.rb
@@ -162,9 +162,6 @@ module BoxesHelper
   #
   # +box+ is always needed
   def block_target(box, block = nil)
-    # FIXME hardcoded
-    return '' if box.position == 1
-
     id =
       if block.nil?
         "end-of-box-#{box.id}"
@@ -172,14 +169,11 @@ module BoxesHelper
         "before-block-#{block.id}"
       end
 
-    content_tag('div', ' ', :id => id, :class => 'block-target' ) + drop_receiving_element(id, :url => { :action => 'move_block', :target => id }, :accept => 'block', :hoverclass => 'block-target-hover')
+    content_tag('div', ' ', :id => id, :class => 'block-target' ) + drop_receiving_element(id, :url => { :action => 'move_block', :target => id }, :accept => box.acceptable_blocks, :hoverclass => 'block-target-hover')
   end
 
   # makes the given block draggable so it can be moved away.
   def block_handle(block)
-    # FIXME hardcoded
-    return '' if block.box.position == 1
-
     draggable_element("block-#{block.id}", :revert => true)
   end
 
diff --git a/app/models/box.rb b/app/models/box.rb
index d293529..6590e40 100644
--- a/app/models/box.rb
+++ b/app/models/box.rb
@@ -2,4 +2,45 @@ class Box < ActiveRecord::Base
   belongs_to :owner, :polymorphic => true
   acts_as_list :scope => 'owner_id = #{owner_id} and owner_type = \'#{owner_type}\''
   has_many :blocks, :dependent => :destroy, :order => 'position'
+
+  def acceptable_blocks
+    to_css_class_name (position == 1) ? acceptable_center_blocks : acceptable_side_blocks
+  end
+
+  private
+
+  def acceptable_center_blocks
+    %w{ MainBlock }
+  end
+
+  def acceptable_side_blocks
+    %w{
+      ArticleBlock
+      CategoriesBlock
+      CommunitiesBlock
+      EnterprisesBlock
+      EnvironmentStatisticsBlock
+      FeaturedProductsBlock
+      FeedReaderBlock
+      HighlightsBlock
+      LinkListBlock
+      LocationBlock
+      LoginBlock
+      MyNetworkBlock
+      PeopleBlock
+      ProfileImageBlock
+      ProfileInfoBlock
+      ProfileSearchBlock
+      RawHTMLBlock
+      RecentDocumentsBlock
+      SellersSearchBlock
+      SlideshowBlock
+      TagsBlock
+    }
+  end
+
+  def to_css_class_name(blocks)
+    blocks.map{ |block| block.underscore.tr('_', '-') }
+  end
+
 end
diff --git a/test/unit/box_test.rb b/test/unit/box_test.rb
new file mode 100644
index 0000000..ec94ce8
--- /dev/null
+++ b/test/unit/box_test.rb
@@ -0,0 +1,15 @@
+require File.dirname(__FILE__) + '/../test_helper'
+
+class BoxTest < ActiveSupport::TestCase
+
+  should 'list allowed blocks for center box' do
+    b = Box.new(:position => 1)
+    assert b.acceptable_blocks.include?('main-block')
+  end
+
+  should 'list allowed blocks for box at position 2' do
+    b = Box.new(:position => 2)
+    assert !b.acceptable_blocks.include?('main-block')
+  end
+
+end
--
libgit2 0.21.2