--- a/.emacs-my	Sat Mar 26 18:50:22 2011 +0200
+++ b/.emacs-my	Sat Mar 26 18:51:05 2011 +0200
@@ -28,6 +28,7 @@
 
 ;; Set the debug option to enable a backtrace when a problem occurs.
 (setq debug-on-error nil)               ; t/nil
+;; (setq debug-on-error t)
 
 ;; Get trace when press C-g.
 (setq debug-on-quit nil)                ; t/nil