diff --git a/app/helpers/boxes_helper.rb b/app/helpers/boxes_helper.rb
index 8d24272..586f8c5 100644
--- a/app/helpers/boxes_helper.rb
+++ b/app/helpers/boxes_helper.rb
@@ -220,14 +220,13 @@ module BoxesHelper
     end
 
     if block.embedable?
-      url = url_for :controller => 'embed', :action => 'index', :id => block.id, :only_path => false;
-
+      embed_code = block.embed_code
+      embed_code = instance_eval(&embed_code) if embed_code.respond_to?(:call)
       html = content_tag('div',
               content_tag('h2', _('Embed block code')) +
               content_tag('div', _('Below, you''ll see a field containing embed code for the block. Just copy the code and paste it into your website or blogging software.'), :style => 'margin-bottom: 1em;') +
-              content_tag('textarea', block.embed_code(url), :style => 'margin-bottom: 1em; width:100%; height:40%;', :readonly => 'readonly') +
+              content_tag('textarea', embed_code, :style => 'margin-bottom: 1em; width:100%; height:40%;', :readonly => 'readonly') +
               thickbox_close_button(_('Close')), :style => 'display: none;', :id => "embed-code-box-#{block.id}")
-
       buttons << thickbox_inline_popup_icon(:embed, _('Embed code'), {}, "embed-code-box-#{block.id}") << html
     end
 
diff --git a/app/models/block.rb b/app/models/block.rb
index 2ec4f85..d207b47 100644
--- a/app/models/block.rb
+++ b/app/models/block.rb
@@ -20,8 +20,17 @@ class Block < ActiveRecord::Base
     false
   end
 
-  def embed_code(url)
-    html = "<iframe src='#{url}' frameborder='0' width='1024' height='768' class='embed block #{self.class.name.to_css_class}'></iframe>"
+  def embed_code
+    me = self
+    lambda do
+      content_tag('iframe', '',
+        :src => url_for(:controller => 'embed', :action => 'index', :id => me.id, :only_path => false),
+        :frameborder => 0,
+        :width => 1024,
+        :height => 768,
+        :class => "embed block #{me.class.name.to_css_class}"
+      )
+    end
   end
 
   # Determines whether a given block must be visible. Optionally a
--
libgit2 0.21.2