diff --git a/app/controllers/public/content_viewer_controller.rb b/app/controllers/public/content_viewer_controller.rb
index 777dec7..f6dc9ea 100644
--- a/app/controllers/public/content_viewer_controller.rb
+++ b/app/controllers/public/content_viewer_controller.rb
@@ -51,8 +51,10 @@ class ContentViewerController < PublicController
     @comment = Comment.new(params[:comment])
     @comment.author = user if logged_in?
     @comment.article = @page
-    if @comment.save!
+    if @comment.save
       @comment = nil # clear the comment form
+    else
+      @form_div = 'opened'
     end
   end
 
diff --git a/app/views/content_viewer/_comment_form.rhtml b/app/views/content_viewer/_comment_form.rhtml
index 77b1254..56a12c6 100644
--- a/app/views/content_viewer/_comment_form.rhtml
+++ b/app/views/content_viewer/_comment_form.rhtml
@@ -4,16 +4,20 @@
 
 <% focus_on = logged_in? ? 'title' : 'name' %>
 
+<%= error_messages_for :comment %>
+
+<% @form_div ||= 'closed' %>
+
 <div
-  class="post_comment_box closed"
-  onclick="f=$(<%= comment_form_id %>); f.style.display='block';
+  class="post_comment_box <%= @form_div %>"
+  onclick="f=$(<%= comment_form_id %>);
            this.className = this.className.replace(/closed/,'opened');
            f.commit.focus(); f['comment[<%= focus_on %>]'].focus();
            this.onclick=null">
 
 <h4><%= _('Post a comment') %></h4>
 
-<% form_tag( {}, { :id => comment_form_id, :style => 'display:none' } ) do %>
+<% form_tag( {}, { :id => comment_form_id } ) do %>
 
   <% unless logged_in? %>
 
diff --git a/app/views/layouts/application.rhtml b/app/views/layouts/application.rhtml
index 965d19a..6b19eba 100644
--- a/app/views/layouts/application.rhtml
+++ b/app/views/layouts/application.rhtml
@@ -26,6 +26,9 @@
       stylesheet_import( "controller_"+ @controller.controller_name(), :themed_source => true )
     %>
 
+    <%# FIXME: for unknow reason the @import url(.../article.css) above dont work for class .post_comment_box.opened/closed %>
+    <%= stylesheet_link_tag 'article' %>
+
     <%# FIXME %>
     <%= stylesheet_link_tag '/designs/templates/default/stylesheets/style.css' %>
     <%= stylesheet_link_tag '/designs/icons/default/style.css' %>
diff --git a/public/stylesheets/article.css b/public/stylesheets/article.css
index 800ae36..2c4425c 100644
--- a/public/stylesheets/article.css
+++ b/public/stylesheets/article.css
@@ -48,3 +48,10 @@
   display: none;
 }
 
+.post_comment_box.closed form {
+  display: none;
+}
+
+.post_comment_box.opened form {
+  display: block;
+}
diff --git a/test/functional/content_viewer_controller_test.rb b/test/functional/content_viewer_controller_test.rb
index 3456fbe..aff28a2 100644
--- a/test/functional/content_viewer_controller_test.rb
+++ b/test/functional/content_viewer_controller_test.rb
@@ -173,4 +173,18 @@ class ContentViewerControllerTest < Test::Unit::TestCase
     assert_tag :tag => 'input', :attributes => { :type => 'text', :name => @controller.icaptcha_field }
   end
 
+  should 'show error messages when make a blank comment' do
+    login_as @profile.identifier
+    page = profile.articles.create!(:name => 'myarticle', :body => 'the body of the text')
+    post :view_page, :profile => @profile.identifier, :page => [ 'myarticle' ], :comment => { :title => '', :body => '' }
+    assert_tag :tag => 'div', :attributes => { :class => 'errorExplanation', :id => 'errorExplanation' }
+  end
+
+  should 'show comment form opened on error' do
+    login_as @profile.identifier
+    page = profile.articles.create!(:name => 'myarticle', :body => 'the body of the text')
+    post :view_page, :profile => @profile.identifier, :page => [ 'myarticle' ], :comment => { :title => '', :body => '' }
+    assert_tag :tag => 'div', :attributes => { :class => 'post_comment_box opened' }
+  end
+  
 end
--
libgit2 0.21.2