module Hpricot::Traverse

def css_path
  if elem? and has_attribute? 'id'
    "##{get_attribute('id')}"
  else
    sim, i, id = 0, 0, 0
    parent.children.each do |e|
      id = sim if e == self
      sim += 1 if e.pathname == self.pathname
    end
    p = parent.css_path
    p = p ? "#{p} > #{self.pathname}" : self.pathname
    p += ":nth(#{id})" if sim >= 2
    p
  end
end