Datepicker question

Datepicker question


I'm setting up a Datepicker and here's a strange thing, this is what I
included
<script src="http://127.0.0.1/ma/js/jquery-1.3.2.min.js" type="text/
javascript"></script>
<link type="text/css" href="http://127.0.0.1/ma/js/themes/ui-lightness/
ui.all.css" rel="stylesheet" />
<script src="http://127.0.0.1/ma/js/ui/ui.datepicker.js" type="text/
javascript"></script>
The "problem" is that this works, without adding the UI Code
<script src="http://127.0.0.1/ma/js/ui/ui.core.js" type="text/
javascript"></script>
Isn't the core required for all widgets to work?
Also, isn't there a min version of the core?
Thanks