Tree Walker: my solution

[Tyrone Hinderson]

nextNode = function(node) {

  console.log(node)

  if(node.childNodes.length > 0) {

    return node.firstChild;

  }

  var next;

  while(next == null && node != null){

    next = node.nextSibling;

    node = node.parentNode

  }

  return next;

};