default_form_builder.rb

#...

ActionView::Base.default_form_builder = CustomizedErrorFormBuilder

#ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
#  if html_tag =~ /<label/
#    %|#{html_tag} <font class="error">#{[instance.error_message].join(', ')}</font>|
#  else
#    error_class = 'fieldWithErrors'
#    nodes = Hpricot(html_tag)
#    nodes.each_child do |node|
#      unless !node.elem? || node[:type] == 'hidden' || node.classes.include?(error_class)
#        node[:class] = node.classes.push(error_class).join(' ')
#      end
#    end
#    nodes.to_html
#  end
#end