Counting page DOM elements

/**
 * Recursively counts the number of DOM domNodes inside a given domNode
 * @param {DomNode} domNome The DOM node to count children for (defaults to the body DOM node)
 * @return {Number} The number of DOM nodes inside this domNode
 */
countNodes = function(domNode) {
  var domNode = domNode || document.body;
  var runningTotal = 1; //this domNode
  
  if (domNode.childNodes.length > 0) {
    for (var i=0; i < domNode.childNodes.length; i++) {
      runningTotal += countNodes(domNode.childNodes[i]);
    };
  };
  
  return runningTotal;
};