var contBlck = document.getElementById('main_wrap');
  var ebookBlck = document.getElementById('e_book');
  var clientHeght = document.compatMode =='CSS1Compat' && !window.opera?document.documentElement.clientHeight:document.body.clientHeight;
  //contBlck.style.height = clientHeght + 'px';
  contBlck.style.height = '10px';
  ebookBlck.style.display = 'block';
  ebookBlck.style.height = (clientHeght > ebookBlck.offsetHeight ? clientHeght : ebookBlck.offsetHeight) + 'px';