How to configure the emacs tool-bar and other misc questions

[Stefano Sabatini <stefasab@gmail.com>]

Hi all,

most default buttons on the toolbar are quite useless to me since all
the corresponding functions correspond to key-bindings I already know
by heart.

So I'd like to customize them to make it dependant on the major mode
I'm in, e.g. in C-programming mode it would be useful to have some
button for hiding/showing functions. I also wonder if I necessarily
need to have an icon for each button, or if it is possible to assign a
text label instead (or any combination of them).

Another unrelated question: when I run describe-mode a new buffer is
shown. If there is just one buffer it is split and the *Help* buffer
is shown on the right side of the active buffer. If there are more
than one active buffers the *Help* buffer is opened on one of the
existing buffer, which is quite annoying since it may cover some
buffer on which I'm working (and which I want to stay visible). So I
wonder how I am supposed to customize the logic for showing the *Help*
buffer given the current layout (e.g. a possibility would be to open a
new frame, or always creating a new buffer without to steal visibility
to an active buffer).

My emacs (today BZR version):
GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1) of 2010-12-06 on arborea

Best regards, emacs forever.
-- 
The real trouble with reality is that there's no background music.