function getKeyCode(e) {
  var keycode;
  if (window.event) {
    keycode = window.event.keyCode;
  } else if (e) {
    keycode = e.which;
  } else {
    return false;
  }
  return keycode;
}

function isEnterPressed(e) {
  var keycode = getKeyCode(e);
  if (keycode == 13) {
     return true;
  } else {
    return false;
  }
}

function isBackSpacePressed(e) {
  var keycode = getKeyCode(e);
  if (keycode == 8) {
     return true;
  } else {
    return false;
  }
}