Add calendra in text box jquery

<link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.8.3.js"></script>
<script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>

<script>
var j = jQuery.noConflict();
    j(function() {
        j( "#datepicker" ).datepicker();
    });
</script>

HTML:- <input type="text" id="datepicker" />