ConTeXt: Chapter numberation and MetaPost figues

[Tobias Burnus <burnus@gmx.de>]

Hi all,

is there a nice way to set the chapter number, I need only the even ones (thus:
Chapter 2, 4, ...). Which screw have I to turn, to set the value manually.

Second: I use something like this:
\startkombination[2*1]
   {\externeabbildung[mp_abb.1][breite=2.5cm]}{a) Leiter}
   {\externeabbildung[mp_abb.2][breite=2.5cm]}{b) Halbleiter}
\stopkombination

I have a mp_add.mp file, in which I have beginfig(1), ...(2),
Using above code, ConTeXt tells me in nice German-Dutch:
figures        : Dimensionen von ./mp_abb.1 geladen von Abbildungsdatei selbst
[MP color conversion ./mp_abb.1 not needed] [MP to PDF ./mp_abb.1] (./mp_abb.1)
{/usr/local/teTeX/share/texmf/dvips/config/pdftex.map} (./main.tuo)
figures        : Abbildungobject mp_abb.2 ist herbraucht
                                              ^^^^^^^^^-Reused
(,,wiederverwendet'')

How can I solve this problem? I don't want to have two same figues in one
document.

Tobias