$this->validatorSchema['image'] = new sfValidatorFile(array(
'path' => sfConfig::get('sf_web_dir') .'/images/XXX/',
'required' => false,
));

$this->validatorSchema['image_delete'] = new sfValidatorPass();


$this->widgetSchema['image'] = new sfWidgetFormInputFileEditable(array(
'file_src' => '/images/XXX/'.$this->getObject()->getImage(),
'is_image' => true,
'edit_mode' => !$this->isNew(),
'template' => '<div>%file%<br />%input%<br />%delete% %delete_label%</div>',
))