public function upload()
 {
     $upload = new UploadImage();
     if ($filedata = $upload->saveImage()) {
         $this->showAjaxReturn(array('pic' => $filedata['attachment'], 'picurl' => C('attachurl') . $filedata['attachment']));
     } else {
         $this->showAjaxError(-1, $upload->error);
     }
 }