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def refresh 
      render :update do |page| 
        page.visual_effect :blindUp, "mockup_#{@mockup.id}"
        page.remove "mockup_#{@mockup.id}"
      end 
    end

  def destroy
    @mockup = Mockup.find(params[:id])
    @mockup.destroy

    respond_to do |format|
      format.html { redirect_to project_mockups_url(@project) }
      format.xml  { head :ok }
      format.js   {refresh}
    end
  end