DataPicker

[jookla]

Sto cercando di mettere questo datapicker:
--http://jqueryui.com/demos/datepicker/

Però non funziona niente secondo voi perchè?

              


                <script>
	$(function() {
		$( "#datepicker" ).datepicker();
	});
	</script>
    <input type="text" name="searchParams.arrivalDate" id="txt_arrival" value="07/02/2011" class="datepicker">
                <span id="arrivalIcon" class="icon_sprite icon_sprite_calendar"></span>
                </p>
              <span id="arrivalDay">Monday</span>
              </div>
            <div class="departure">
              <label for="txt_departure">Check out</label>
              


                <input type="text" name="searchParams.departureDate" id="txt_departure" value="08/02/2011" class="datepicker">
                <span id="departureIcon" class="icon_sprite icon_sprite_calendar"></span>
                <span class="nights" id="nights"> one night</span>
                </p>
              <span id="departureDay">Tuesday</span>
              </div>

Ho scaricato il file js da:
-http://jquery-ui.googlecode.com/svn/trunk/ui/i18n/

cioè:
jquery.ui.datepicker-it.js

[webdemo]

sposto in JS