function viewabs(checkbox) {
  var newstyle;
  if (checkbox.checked) {
    newstyle = "block";
  } else {
    newstyle = "none";
  }
  abss = document.getElementsByTagName("blockquote");
  for (var i = 0; i < abss.length; i++) {
    abss[i].style.display = newstyle;
  }
}