class Kramdown::Converter::Html

def convert_footnote(el, indent)
  number = @footnote_counter
  @footnote_counter += 1
  @footnotes << [el.options[:name], el.value]
  "<sup id=\"fnref:#{el.options[:name]}\"><a href=\"#fn:#{el.options[:name]}\" rel=\"footnote\">#{number}</a></sup>"
end