Datepicker uses wrong year if this is not selected at least

Datepicker uses wrong year if this is not selected at least

Hi all,
I have a datePicker defined in this way

$("#dayOfBirth").datepicker({
                                changeMonth: true,
                                changeYear: true,
                                dateFormat: 'dd/mm/yy',
                                yearRange: '1900:2000',
                                showAnim: 'slideDown',
                                onClose: function(date) {
                                        abc();
                                }
                        });


the problem is that when I the datepicker is shown the user sees 1900 in the year's selectbox but when he choose the day this is added as xx/xx/2009.
Someone knows how can I fix this?

regards