# File lib/merb_helpers/form_helpers.rb, line 263
      def checkbox_field(attrs = {}, hidden_attrs={})
        boolbox = true
        boolbox = false if ( attrs.has_key?(:boolean) and !attrs[:boolean] )
        attrs.delete(:boolean)

        if( boolbox )
                on            = attrs.delete(:on)  || 1
                off           = attrs.delete(:off) || 0
                attrs[:value] = on if ( (v = attrs[:value]).nil? || v != "" )
        else
                # HTML-escape the value attribute
                attrs[:value] = escape_xml( attrs[:value] )
        end

        attrs.merge!(:type => :checkbox)
        attrs.add_html_class!("checkbox")
        (boolbox ? hidden_field({:name => attrs[:name], :value => off}.merge(hidden_attrs)) : '') + optional_label(attrs){self_closing_tag("input", attrs)}
      end