gistfile1.rb

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  unless html_tag =~ /^<label/
    %{<span class="field_with_errors">#{html_tag}<label for="#{instance.send(:tag_id)}" class="message"> #{instance.error_message.first}</label></span>}.html_safe
  else
    #%{<span class="field_with_errors">#{html_tag}</span>}.html_safe
    %{#{html_tag}}.html_safe
  end 
end