public void goBack() {
   if (chapter.getVisibility() == View.INVISIBLE) {
     chapter.setVisibility(View.VISIBLE);
     savehistory();
   } else {
     ((main) mContext).exitApp();
   }
 }
 /**
  * Show chapter view
  *
  * @param scrollto if scroll in
  */
 public void showChapters(boolean scrollto) {
   savehistory();
   chapter.setVisibility(View.VISIBLE);
   //		content.setVisibility(View.);
   if (scrollto) {
     showChapterAnimation();
   } else {
   }
 }