# File lib/merb_helpers/form_helpers.rb, line 439
      def options_for_select(collection, attrs = {})
        prompt     = attrs.delete(:prompt)
        blank      = attrs.delete(:include_blank)
        selected   = attrs.delete(:selected)
        ret = String.new
        ret << tag('option', prompt, :value => '') if prompt
        ret << tag("option", '', :value => '') if blank
        unless collection.blank?
          if collection.is_a?(Hash)
            collection.each do |label,group|
              ret << open_tag("optgroup", :label => label.to_s.gsub(/\b[a-z]/) {|x| x.upcase}) + 
                options_for_select(group, :selected => selected) + "</optgroup>"
            end
          else
            collection.each do |value,text|
              options = Array(selected).include?(value) ? {:selected => 'selected'} : {}
              ret << tag( 'option', text, {:value => value}.merge(options) )
            end
          end
        end

        return ret
      end