Undefined variable warning in comment.js

In some IE browsers the code below generates a warning, due to the undefined variable i

Drupal.behaviors.comment = function (context) {
  var parts = new Array("name", "homepage", "mail");
  var cookie = '';
  for (i=0;i<3;i++) {

Is recommended to define the variable var i=0; before assigning any value

Drupal.behaviors.comment = function (context) {
  var parts = new Array("name", "homepage", "mail");
  var cookie = '';
  var i = 0;
  for (i=0;i<3;i++) {

I've seen the same javascript issues in other modules like Outbrain.