gistfile1.rb

#show.js.erb
$('#comments').html('<%= escape_javascript render(@comments) %>');
$('#paginator').html('<%= escape_javascript(paginate(@comments, :remote => true).to_s) %>');  

#announces_controller.rb
def show
    @announce = Announce.find(params[:id])
    @comments = Comment.order("created_at desc").where(:announce_id => @announce.id).includes(:attachments).page(params[:page]).per(10)
    @comment = @announce.comments.build
    @comment.attachments.build
    respond_to do |format|
      format.html # show.html.erb
      format.js
      format.xml  { render :xml => @announce }
    end
  end