How do I retrieve selected date from inline datepicker?

How do I retrieve selected date from inline datepicker?

Hi,
I have a newbie problem with the implementation of the inline datepicker.
The calender looks and works just fine but I have no success in retrieving the date when selected. I have tried to refering to the #datepicker_start with no success. Any help or suggestions would be much appreciated:

 

HTML: <div id='datepicker_start' name='datepicker_start'> </div>


SCRIPT:    $(function() {
                  $("#datepicker_start").datepicker();
        });
    
   
PHP: $start = $_REQUEST['datepicker_start'];