Index: extlink.js
===================================================================
--- extlink.js	(Revision 287)
+++ extlink.js	(Arbeitskopie)
@@ -1,8 +1,8 @@
 if (Drupal.jsEnabled) {
   $(document).ready(function() {
     // Strip the host name down, removing subdomains or www.
-    var host = window.location.host.replace(/^(([^\/]+?\.)*)([^\.]{4,})((\.[a-z]{1,4})*)$/, '$3$4');
-    var subdomain = window.location.host.replace(/^(([^\/]+?\.)*)([^\.]{4,})((\.[a-z]{1,4})*)$/, '$1');
+    var host = window.location.host.replace(/^(([^\/]+?\.)*)([^\.]{2,})((\.[a-z]{1,4}))$/, '$3$4');
+    var subdomain = window.location.host.replace(/^(([^\/]+?\.)*)([^\.]{2,})((\.[a-z]{1,4}))$/, '$1');
 
     // Determine what subdomains are considered internal.
     if (Drupal.settings.extlink.extSubdomains) {