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document.querySelector('body').classList.add('tizen');

  if (!window.indexedDB) {
    window.indexedDB = window.webkitIndexedDB;
  }
  if (!window.MutationObserver) {
    window.MutationObserver = window.WebKitMutationObserver;
  }

  document.addEventListener('tizenhwkey', function(e) {
    if (e.keyName == "back") {
      if (currentOverlay == null || currentOverlay == 'emptygallery') {
        tizen.application.getCurrentApplication().exit();
      } else {
        showOverlay(null);
      }
    }
  });