document.getComments = function getComments(pnode, result) {
  pnode = pnode || document.documentElement
  result = result || []
  var cnodes = pnode.childNodes
    , cnode, i

  for (i = -1; (cnode = cnodes[++i]); ) {
    if (cnode.nodeType !== 8) {
      getComments(cnode, result)
    } else {
      result.push(cnode)
    }
  }
  return result
}