gistfile1.coffee

    $body = $("body")

    $body.attr "data-#{winH}", $body.attr("data-intro")
    $body.removeAttr "data-intro"

    for i in [1..8]
      $body.attr "data-#{win2 * i}", $body.attr("data-section-#{i}")
      $body.removeAttr "data-section-#{i}"

gistfile2.haml

%body{"data-intro" => "background: rgb(81, 86, 109)",
  "data-section-1" => "background: rgb(69, 82, 121)",
  "data-section-2" => "background: rgb(94, 107, 151)",
  "data-section-3" => "background: rgb(68, 74, 100)",
  "data-section-4" => "background: rgb(94, 108, 154)",
  "data-section-5" => "background: rgb(67, 72, 95)",
  "data-section-6" => "background: rgb(65, 73, 104)",
  "data-section-7" => "background: rgb(41, 50, 71)",
  "data-section-8" => "background: rgb(94, 109, 157)"}