Adding an item in the Gallery from the front

$gallery = $modx->getService('gallery','Gallery',$modx->getOption('gallery.core_path',null,$modx->getOption('core_path').'components/gallery/').'model/gallery/',$scriptProperties);
      if (!($gallery instanceof Gallery)) return '';
      $modx->lexicon->load('gallery:web');
      $store = $modx->newObject('galItem');
      $store->fromArray(array(
        'id' => NULL,
        'name' => trim($_POST['title']),
        'filename' => intval($_POST['category']).'/',
        'description' => trim($_POST['descr']),
        'mediatype' => 'image',
        'createdon' => strftime('%Y-%m-%d %H:%M:%S'),
        'createdby' => intval($_POST['uid']),
        'active' => '1',
        'watermark_pos' => 'tl'
      ));
      $store->save();