(function($) {

  $.fn.randomize = function(childElem) {
    return this.each(function() {
      var $this = $(this);
      var unsortedElems = $this.children(childElem);
      var elems = unsortedElems.clone();

      elems.sort(function() { return (Math.round(Math.random())-0.5); });

      for(var i=0; i < elems.length; i++)
        unsortedElems.eq(i).replaceWith(elems[i]);
    });
  };

})(jQuery);