def div_wrapper(attribute, options = {}, &block)
    options[:id]    = _wrapper_id      attribute, options[:id]
    options[:class] = _wrapper_classes attribute, options[:class]

    template.content_tag :div, options, &block
  end
Wraps the contents of +block+ inside a +tag+ with an appropriate class and
id for the object's +attribute+. HTML options can be overridden by passing
an +options+ hash.