/**
  * Upload a photo
  *
  * @param $form object FormUI object
  * @return string HTML that displays feedback message
  */
 public function upload_photo()
 {
     $temp_file = $_FILES['upload_file']['tmp_name'];
     $album = $_POST['upload_album'];
     $summary = $_POST['summary'];
     $filename = $_FILES['upload_file']['name'];
     $picasa = new Picasa();
     $result = $picasa->upload_photo($temp_file, $album, $filename, $summary);
     if (!$result) {
         return "<span>Error uploading photo</span>";
     } else {
         return "<span>Photo successfuly uploaded</span>";
     }
 }