jQuery Grid Plugin - jqGrid

Hi, I had a datepicker in my page and worked fine but now, after put my grid with jQgrid, it doesn't work. Anybody knows why?

Please, try to put this code in your page and tell me if it works, ok?

 <script>
 $(function() {
 $( "#datepicker" ).datepicker();
 });
 </script>


<div>
   <p>Date: <input id="datepicker" type="text"></p>
</div>