// adds .naturalWidth() and .naturalHeight() methods to jQuery
  // for retreaving a normalized naturalWidth and naturalHeight.
  (function($){
    var
    props = ['Width', 'Height'],
    prop;

    while (prop = props.pop()) {
    (function (natural, prop) {
      $.fn[natural] = (natural in new Image()) ? 
      function () {
      return this[0][natural];
      } : 
      function () {
      var 
      node = this[0],
      img,
      value;

      if (node.tagName.toLowerCase() === 'img') {
        img = new Image();
        img.src = node.src,
        value = img[prop];
      }
      return value;
      };
    }('natural' + prop, prop.toLowerCase()));
    }
  }(jQuery));