# File lib/merb-helpers/form/builder.rb, line 52
    def unbound_check_box(attrs)
      update_unbound_controls(attrs, "checkbox")
      if attrs.delete(:boolean)
        on, off = attrs.delete(:on), attrs.delete(:off)
        unbound_hidden_field(:name => attrs[:name], :value => off) <<
          self_closing_tag(:input, {:type => "checkbox", :value => on}.merge(attrs))
      else
        self_closing_tag(:input, {:type => "checkbox"}.merge(attrs))
      end
    end