toggleAttr() jQuery plugin

/*!
 * toggleAttr() jQuery plugin
 * @link http://github.com/mathiasbynens/toggleAttr-jQuery-Plugin
 * @description Used to toggle selected="selected", disabled="disabled", checked="checked" etc…
 * @author Mathias Bynens <http://mathiasbynens.be/>
 */
;(function($) {
 $.fn.toggleAttr = function(attr) {
  return this.each(function() {
   $(this).attr(attr) ? $(this).removeAttr(attr) : $(this).attr(attr, attr);
  });
 };
})(jQuery);