[jQuery] 스크롤 따라다니는 박스

CSS :

#sidebox { 
background-color:#F0F0F0; 
position:absolute; 
width:120px; 
top:433px; 
right:420px; 
padding: 3px 10px }

Java Script :

var currentPosition = parseInt($("#sidebox").css("top"));
$(window).scroll(function()
{       var position = $(window).scrollTop();
       $("#sidebox").stop().animate({"top":position+currentPosition+"px"},1000);
 });

HTML :

<div id="sidebox">
내용 입력
</div>