diff --git a/source/app/models/version.rb b/source/app/models/version.rb
index 806db21..4623f16 100644
--- a/source/app/models/version.rb
+++ b/source/app/models/version.rb
@@ -136,12 +136,16 @@
   
   # Absolute path to the diff file and paths to the intermediate (tidied, cleaned) HTML files
   def path_to_diff(from_version)
-    return "#{ENV['EPFWIKI_ROOT_DIR']}#{ENV['EPFWIKI_PUBLIC_FOLDER']}/#{relpath_to_diff(from_version)}"
+    "#{ENV['EPFWIKI_ROOT_DIR']}#{ENV['EPFWIKI_PUBLIC_FOLDER']}/#{relpath_to_diff(from_version)}"
   end
   
   # Relative path to the diff file
   def relpath_to_diff(from_version)
-    return ENV['EPFWIKI_BASE_URL'] + self.wiki.rel_path + '/' + self.page.rel_path + "_EPFWIKI_DIFF_V#{from_version.version}_V#{self.version}.html"  
+    '/' + self.wiki.rel_path + '/' + self.page.rel_path + "_EPFWIKI_DIFF_V#{from_version.version}_V#{self.version}.html"  
+  end
+  
+  def url_to_diff(from_version)
+    ENV['EPFWIKI_BASE_URL'] + self.relpath_to_diff(from_version)
   end
   
   # Path intermediate (tidied, cleaned) HTML files, prepared for XHTMLDiff
diff --git a/source/app/views/versions/diff.html.erb b/source/app/views/versions/diff.html.erb
index 98f9d4f..e7fd69e 100644
--- a/source/app/views/versions/diff.html.erb
+++ b/source/app/views/versions/diff.html.erb
@@ -33,10 +33,10 @@
             Differences
           </th>
           <td class="sectionTableCell">
-            <p><a href="<%= @version.relpath_to_diff(@version.source_version) %>" target="_blank">Open in a new window</a></p>
+            <p><a href="<%= @version.url_to_diff(@version.source_version) %>" target="_blank">Open in a new window</a></p>
             <iframe 
             height = "600"
-            src ="<%= @version.relpath_to_diff(@version.source_version) %>"
+            src ="<%= @version.url_to_diff(@version.source_version) %>"
             width="100%">
             </iframe>
           </td>
diff --git a/source/config/environments/production.rb.example b/source/config/environments/production.rb.example
index e46ff14..0607796 100644
--- a/source/config/environments/production.rb.example
+++ b/source/config/environments/production.rb.example
@@ -3,7 +3,7 @@
 
   ENV['EPFWIKI_APP_NAME'] = 'EPF Wiki'
   ENV['EPFWIKI_REPLY_ADDRESS'] = "no-reply@epf.eclipse.org"
-  ENV['EPFWIKI_BASE_URL'] = "http://localhost" # used for creating absolute links in emails, including slash
+  ENV['EPFWIKI_BASE_URL'] = "http://localhost" # used for creating absolute links in emails, without trailing slash
   ENV['EPFWIKI_WINDOWS'] = 'N' # Y/N 
   ENV['EPFWIKI_PUBLIC_FOLDER'] = 'public'
   ENV['EPFWIKI_ROOT_DIR'] = File.expand_path(Rails.root) + '/'