Wish list setting fonts and font size

[winuser]

:confused:
GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.20.0) of 2010-03-29 on
rothera, modified by Debian
On Ubuntu 10.10 this is the official Synaptic package.
In Menu > Options > Set default font seting a font is easy . Saving options
I'm still ok with that. What I wish for is that those actions would not zap
the input buffer.

I found this while surfing emacs sites :
(defun toggle-fullscreen () ;; bound to super - f12
  (interactive)
  (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
                         '(2 "_NET_WM_STATE_MAXIMIZED_VERT" 0))
  (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
                         '(2 "_NET_WM_STATE_MAXIMIZED_HORZ" 0))
)
( toggle-fullscreen )

It's in my .emacs file but isn't there a way to switch fonts without the
hassle ?

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