diff --git a/js/jquery.bootstrap.js b/js/jquery.bootstrap.js
index a2daad9..12edea2 100644
--- a/js/jquery.bootstrap.js
+++ b/js/jquery.bootstrap.js
@@ -43,7 +43,7 @@ Dependence: N/A
 
       var msghtml
         = ''
-        + '<div class="dialog modal fade">'
+        + '<div class="dialog modal fade" tabindex="-1" role="dialog">'
         + '<div class="modal-dialog">'
         +   '<div class="modal-content">'
         +     '<div class="modal-header">'
@@ -916,4 +916,4 @@ Dependence: string.format.js
     return self
   };
 
-})(jQuery);
\ No newline at end of file
+})(jQuery);