Untitled

(global-set-key (kbd "C-x 2") (lambda () 
                (interactive)
                (split-window-vertically)
                (other-window 1)))

; When splitting horizontally, select the newly splitted window
(global-set-key (kbd "C-x 3") (lambda () 
                (interactive)
                (split-window-horizontally)
                (other-window 1)))