SASS mult() function

sass_multiply.rb

module Sass::Script::Functions
  def mult(color1, color2)
    c1 = color1.rgb.map { |c| c / 255.0 }
    c2 = color2.rgb.map { |c| c / 255.0 }
    Sass::Script::Color.new(c1.zip(c2).map { |a,b| (a*b*255).to_i })
  end
end

tr.active.odd td
  background-color: mult($odd, $highlight_color)
tr.active.even td
  background-color: mult($even, $highlight_color)