size = "Blank";

var hint = 'Check your units carefully. There are 3.26 lightyears in a parsec.';

function noenter() {
  return !(window.event && window.event.keyCode == 13); 
}

function checkme() {
  size = document.hubble.answer.value - 0;
  if (!size) {size = "Blank";}

  RightOnFile = './hubble-data-correct.html';
  WayWrongFile = './hubble-data-wrong.html';

  low_good = 63;
  hi_good = 65;

  if ((size == "Blank") || (size > hi_good) || (size < low_good)) {
    location = WayWrongFile;
  }
  else {
    location = RightOnFile;
  }
}