# File lib/hpricot/traverse.rb, line 46
    def nodes_at(*pos)
      sib = parent.children
      i, si = 0, sib.index(self)
      Elements[*
        sib.select do |x|
          sel = case i - si when *pos
                  true
                end
          i += 1
          sel
        end
      ]
    end