problem changing datepicker's date format of

problem changing datepicker's date format of

I am having difficulty trying to change the format of selected date from date picker. This is a test so my code is very simple. Here it is.

    $("#datepicker").datepick({   

            onSelect: function(dates) {
            alert('date picked is ' + dates);           
            var f = $.datepick.formatDate("mm-dd-yyyy",dates);
            alert(f);
             }
             
        });


I have also tried setting the dateformat property but that doesn't work either.

    $("#datepicker").datepick({   
            dateFormat: "mm-dd-yyyy",
            onSelect: function(dates) {
            alert('date picked is ' + dates);           
             }
             
        });

It display the date as Fri Mar 18 2011 12:00:00 GMT-0700 (US Mountain Standard Time).

Thanks.
alex