JQuery Popup Calendar

Hi I need to have the date formatted and written to the input field in UK format but not sure how to do this in JQuery.  The following must be wrong because it isn't putting the date in UK format so could someone please tell me what I'm doing wrong?

$(document).ready(function() {

$('#Date').datepicker({
                  onSelect: function(dateText, inst) {
                        var s = dateText.split("/");
                        $("#$YEAR$").val(s[2]);
                        $("#$DAY$").val(s[1]);
                        $("#$MONTH$").val(s[0]);
                        var ukDate = s[1]+s[0]+s[2];
                        //alert("UK Date is "+ukDate);
                        //$("#Date").val(ukDate);
                        dateFormat: 'dd-mm-yy';
                  }
            });
$('a[rel*=lightbox]').lightBox(); // Select all links that contains lightbox in the attribute rel

});