BINGO!!! Finally got it !
I used Alternative Solution with dvipng
http://meta.wikimedia.org/wiki/Running_Mediawiki_on_Windows#Alternative_Sol…
But moreover, in the includes/math.php for this solution
http://meta.wikimedia.org/wiki/Help:Running_MediaWiki_on_Windows/math-dvipn…
I changed
var $_dvips_path = 'dvips.exe';
to
var $_dvips_path = 'dvipng.exe';
Beforehands the fatal problem was, that my dvipng.exe was not working
well - no error written, but it did simply nothing. I changed from
TeXlive to MiKTeX and it's ok...
--
Martin Mrazek
Mobil: +420 724 17 666 9
Skype: martin.mrazek.cz
ICQ: 339-042-961 (mrazik)