Initial code using Drupal 6.38

modules/comment/comment.js

@@ -0,0 +1,34 @@
+
+Drupal.behaviors.comment = function (context) {
+  var parts = new Array("name", "homepage", "mail");
+  var cookie = '';
+  for (i=0;i<3;i++) {
+    cookie = Drupal.comment.getCookie('comment_info_' + parts[i]);
+    if (cookie != '') {
+      $("#comment-form input[name=" + parts[i] + "]:not(.comment-processed)", context)
+        .val(cookie)
+        .addClass('comment-processed');
+    }
+  }
+};
+
+Drupal.comment = {};
+
+Drupal.comment.getCookie = function(name) {
+  var search = name + '=';
+  var returnValue = '';
+
+  if (document.cookie.length > 0) {
+    offset = document.cookie.indexOf(search);
+    if (offset != -1) {
+      offset += search.length;
+      var end = document.cookie.indexOf(';', offset);
+      if (end == -1) {
+        end = document.cookie.length;
+      }
+      returnValue = decodeURIComponent(document.cookie.substring(offset, end).replace(/\+/g, '%20'));
+    }
+  }
+
+  return returnValue;
+};