Wt

see this fragment in Wt.js:

this.contains = function(w1, w2) {
  var p = w2.parentNode;

  while (p != null && p.tagName.toLowerCase() != "body") {
    if (p == w1)
      return true;
    p = p.parentNode;
  }
  return false;
}

in some cases

the "w2" could be null

this function will throw an expection

and will be catched by "handleResponse" function

"Wt internal error" message with "80020101 error" will be shown in IE

the same type error also be shown in FF.

after I change the code like this:

this.contains = function(w1, w2) {
  if (!w2)
    return false;

  var p = w2.parentNode;

  while (p != null && p.tagName.toLowerCase() != "body") {
    if (p == w1)
      return true;
    p = p.parentNode;
  }
  return false;
}

the "Wt internal error" is never shown.