# Preload images by creating a hidden div
  #
  # .preload {
  #   position: absolute;
  #   left: 1000px;
  #   top: 1000px;
  # }
  def preload_images(*images)
    output = ""
    images.each do |image_path|
      output << "<div class=\"preload\" style=\"background: url(/images/#{image_path})\"></div>"
    end
    output
  end