function open_block(id)
{
  var e=_ge(id);
  e.style.visibility=e.style.visibility!='visible'?'visible':'hidden';
}

function open_block2(id)
{
  var e=_ge(id);
  e.style.display=e.style.display!='block'?'block':'none';


  var e2 = _ge('content_thanks_div');
  if (e2) e2.style.display = 'none';
}