not styles in datepicker

not styles in datepicker


I just applied the datepicker to a date field in a form with jQuery
1.3.1 and jQuery UI 1.5.3 (all components). I'm initializing it with
the following code:
$(".date").each(function() {
    $(this).datepicker({changeMonth: true, changeYear: true, showOn:
'button', buttonImage: '<?=Zend_Registry::get('baseUrl')?><?
=Zend_Registry::get('dirConfig')->img?>/icons/calendar.gif',
buttonImageOnly: true});
});
The datepicker is opening without any styles. Do I have to download
anything else in order for the datepicker to look like the one on
jQuery UI website demo?
btw, the minified version of jQuery UI 1.5.3 seems to be corrupt. It
gives some horrible-looking error when I try to use it.