Get an image's natural width and height

natural.js

(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));