--- a/.emacs-my	Thu Dec 23 00:57:29 2010 +0200
+++ b/.emacs-my	Sun Jan 02 21:03:16 2011 +0200
@@ -112,6 +112,11 @@
   (when (>= emacs-major-version 22) (tooltip-mode -1))
   )
 
+(when window-system
+  ;; Prefer horizontal windows splitting.
+  (setq split-height-threshold 15)
+  )
+
 (setq frame-title-format "Emacs - %b")
 
 (setq default-header-line-format nil)