--- includes/theme.inc-orig	2011-07-14 19:39:19.000000000 +0200
+++ includes/theme.inc	2011-07-14 19:43:56.000000000 +0200
@@ -2217,7 +2217,7 @@
     }
   }
   $variables['head_title_array'] = $head_title;
-  $variables['head_title'] = implode(' | ', $head_title);
+  $variables['head_title'] = strip_tags(implode(' | ', $head_title));
 
   // Populate the page template suggestions.
   if ($suggestions = theme_get_suggestions(arg(), 'html')) {
@@ -2466,7 +2466,7 @@
   $language = isset($GLOBALS['language']) ? $GLOBALS['language'] : language_default();
 
   $variables['head_title_array']  = $head_title;
-  $variables['head_title']        = implode(' | ', $head_title);
+  $variables['head_title']        = strip_tags(implode(' | ', $head_title));
   $variables['base_path']         = base_path();
   $variables['front_page']        = url();
   $variables['breadcrumb']        = '';