datepicker question

 function onClose()
    {
        // Capture the Date from User Selection
        var checkIn = new Date( $.datepicker.parseDate('mm/dd/y', $('.roomCheckIn').val() ) );
        var checkOut = new Date( $.datepicker.parseDate('mm/dd/y', $('.roomCheckOut').val() ) );
        if (checkIn != null && checkOut != null)
        {
            // end - start returns difference in milliseconds
            var diff = new Date(checkOut - checkIn);
            // get days
            var nights = diff/1000/60/60/24;
            $('#LRESNNC').val(nights);
            echo ("Update number of nights to: " + nights);
            //echo($('#LRESNNC').val());
        }
    }
 function onClose()
    {
        // Capture the Date from User Selection
        var checkIn = new Date( $.datepicker.parseDate('mm/dd/yy', $('.roomCheckIn').val() ) );
        var checkOut = new Date( $.datepicker.parseDate('mm/dd/yy', $('.roomCheckOut').val() ) );
        if (checkIn != null && checkOut != null)
        {
            // end - start returns difference in milliseconds
            var diff = new Date(checkOut - checkIn);
            // get days
            var nights = diff/1000/60/60/24;
            $('#LRESNNC').val(nights);
            echo ("Update number of nights to: " + nights);
            //echo($('#LRESNNC').val());
        }
    }