datepicker: unable to set spanish region

datepicker: unable to set spanish region

I need datepicker to work in spanish region (day/month/year).  But I always get the month first.  I also downloaded a filed called jquery.ui.datepicker-es.js  and put it in the same directory where this file is jquery-ui-1.8.4.custom.min.js but still it dos not work.  I know it worked in the example. What am I doing wrong??

  1. <!DOCTYPE html>
    <html>
    <head>
      <link href="css/ui-lightness/jquery-ui-1.8.4.custom.css" rel="stylesheet" type="text/css"/>
      <script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
      <script type="text/javascript" src="js/jquery-ui-1.8.4.custom.min.js"></script>

      <script>
      $(document).ready(function() {
        $("#datepicker").datepicker($.datepicker.regional['es']);
      });
      </script>
    </head>
    <body style="font-size:62.5%;">
    <p>Date: <input type="text" id="datepicker" size="10" maxlength="10">
    </p> 
    </body>
    </html>