Untitled

Why those files are missing?
$startdate = new ZendX_JQuery_Form_Element_DatePicker( 'startdate' );
$startdate->setLabel('Start Date')
          ->setRequired(true)
          ->setAttrib('size', '10')
          ->setDecorators($formJQueryElements);

/application
/library
    /Zend
    /ZendX

// Add start_date element
    $start_date = new Zend_Form_Element_Text('start_date');
    $start_date->setLabel('Start Date')
          ->setRequired(true)
          ->setAttrib('class', 'datepicker')
          ->setDecorators($this->elementDecorators);
    $this->addElement($start_date);