(function($) {

    $.fn.newsScroll = function(options) {

        return this.each(function() {

            var 
  $this = $(this),

  defaults = {
      speed: 400,
      delay: 3000,
      list_item_height: $this.children('li').outerHeight()
  },

  settings = $.extend({}, defaults, options);

            setInterval(function() {
                $this.children('li:first')
  .animate({
      marginTop: '-' + settings.list_item_height,
      opacity: 'hide'
  },

  settings.speed,

  function() {
      $this
  .children('li:first')
  .appendTo($this)
  .css('marginTop', 0)
  .fadeIn(300);
  }
  ); // end animate
            }, settings.delay); // end setInterval
        });
    }

})(jQuery);