$("document").ready(function() {  
  
    var currentPosition = parseInt($("#right_section").css("top"));  
  
    $(window).scroll(function() {  
            var position = $(window).scrollTop(); // ÇöÀç ½ºÅ©·Ñ¹ÙÀÇ À§Ä¡°ªÀ» ¹ÝȯÇÕ´Ï´Ù.  
            $("#right_section").stop().animate({"top":position+currentPosition+"px"},900);  
    });  
      
});