variable_set???

k@mail:~/craigslist$ ./img.rb
./img.rb:15:in `read_config': undefined method `variable_set' for ImgGen:Module (NoMethodError)
    from ./img.rb:15:in `each'
    from ./img.rb:15:in `read_config'
    from ./img.rb:9:in `start'
    from ./img.rb:22
k@mail:~/craigslist$ cat img.rb
#!/usr/bin/env ruby

%w[ rubygems RMagick yaml ].each{|l| require l  }
include Magick

module ImgGen
    class << self
        def start()
            read_config("img.yaml")
            stripes = ImageList.new
            puts "ohi #{width}"
        end
        def read_config(file)
            c=YAML.load_file(file)
            c["img"].each { |key, value| variable_set("#{key}", value) }
        end
    end
end
#canvas = Magick::Image.new(240, 300,
#              Magick::HatchFill.new('white','lightcyan2'))
#gc = Magick::Draw.new
ImgGen.start()