Changed the use of the cookie with the better, cleaner use of the

?destination=... option

back_from_comment.js

-/* Code by Zewa */
+/* Code first created by Zewa,
+ * fixed up by AlexisWilke so it works with any type of page
+ */
 /**
-* Reply button for comments.
+* Reply, Edit & Delete buttons for included comments.
 *
 * Store where the user was when clicking add comment or reply,
-* and bring him back there afterwards.
+* and bring him or her back there afterwards.
 */
-$("a[href*='comment/reply']").click(function () {
-    $.cookie('reply_topic_url', location.href);
-  });
-$("a[href*='comment/edit']").click(function () {
-    $.cookie('reply_topic_url', location.href);
-  });
-$("a[href*='comment/delete']").click(function () {
-    $.cookie('reply_topic_url', location.href);
-  });
-
-/**
-* Check on each forum site.
-* When the cookie has been placed, we know a forum thread was created.
-*/
-$("div[class='breadcrumb']").children().each(function(){
-    if($(this).attr("href") == '/drupal/?q=forum') {
-      var loc = $.cookie('reply_topic_url');
-      if(loc != null && loc != undefined) {
-        $.cookie('reply_topic_url', "");
-        document.location.href = loc + '#attached_comment_start';
-      }
-    }
-  });
+function node_insert_destination(link){
+  attr=jQuery(link).attr('href');
+  attr+=attr.indexOf('?')==-1?'?':'&';
+  url=location.pathname.substring(1);
+  jQuery(link).attr('href',attr+'destination='+url);
+}
+jQuery("a[href*='comment/reply'],a[href*='comment/edit'],a[href*='comment/delete']").click(function(){node_insert_destination(this);});

insert_node.module

@@ -9,7 +9,10 @@
 function insert_node_init() {
   // If you experience side effects, feel free to comment out this add.
   // All you lose is the coming back to the node including the comment.
-  drupal_add_js(drupal_get_path('module', 'insert_node') .'/back_from_comment.js');
+  if (function_exists('jquery_plugin_add')) {
+    jquery_plugin_add('cookie');
+    drupal_add_js(drupal_get_path('module', 'insert_node') .'/back_from_comment.js');
+  }
 }
 
 /**