def url_for(page)
      page_one = page == 1
      unless @url_string and !page_one
        @url_params = {}
        # page links should preserve GET parameters
        stringified_merge @url_params, @template.params if @template.request.get?
        stringified_merge @url_params, @options[:params] if @options[:params]
        
        if complex = param_name.index(/[^\w-]/)
          page_param = (defined?(CGIMethods) ? CGIMethods : ActionController::AbstractRequest).
            parse_query_parameters("#{param_name}=#{page}")
          
          stringified_merge @url_params, page_param
        else
          @url_params[param_name] = page_one ? 1 : 2
        end

        url = @template.url_for(@url_params)
        return url if page_one
        
        if complex
          @url_string = url.sub(%r!((?:\?|&amp;)#{CGI.escape param_name}=)#{page}!, '\1@')
          return url
        else
          @url_string = url
          @url_params[param_name] = 3
          @template.url_for(@url_params).split(//).each_with_index do |char, i|
            if char == '3' and url[i, 1] == '2'
              @url_string[i] = '@'
              break
            end
          end
        end
      end
      # finally!
      @url_string.sub '@', page.to_s
    end
def url_for(page)
      page_one = page == 1
      unless @url_string and !page_one
        @url_params = {}
        # page links should preserve GET parameters
        stringified_merge @url_params, @template.params if @template.request.get?
        stringified_merge @url_params, @options[:params] if @options[:params]
        
        if complex = param_name.index(/[^\w-]/)
          page_param = (defined?(CGIMethods) ? CGIMethods : ActionController::AbstractRequest).
            parse_query_parameters("#{param_name}=#{page}")
          
          stringified_merge @url_params, page_param
        else
          @url_params[param_name] = page_one ? 1 : 2
        end

        url = @template.url_for(@url_params)
        return url if page_one
        
        if complex
          @url_string = url.sub(%r!((?:\?|&amp;)#{CGI.escape param_name}=)#{page}!, '\1@')
          return url
        else
          @url_string = url
          @url_params[param_name] = 3
          @template.url_for(@url_params).split(//).each_with_index do |char, i|
            if char == '3' and url[i, 1] == '2'
              @url_string[i] = '@'
              break
            end
          end
        end
      end
      # finally!
      @url_string.sub '@', page.to_s
    end
Returns URL params for +page_link_or_span+, taking the current GET params
 and <tt>:params</tt> option into account.