public function checkS3Usage()
{
if (is_null($this->useS3)) {
$currentStorage = (int) Mage::app()->getConfig()->getNode(Mage_Core_Model_File_Storage::XML_PATH_STORAGE_MEDIA);
$this->useS3 = $currentStorage == Arkade_S3_Model_Core_File_Storage::STORAGE_MEDIA_S3;
}
return $this->useS3;
}