Thanks to Henning Meier-Geinitz for the answer. (I'm reading only the digest version, so I can't use the reply button) I will try what you recommend. Greetings Hellmut -- Dr. Hellmut Weber Degenfeldstraße 2, D - 80803 München-Schwabing tel (+49 89) 3081172, mobil (+49 172) 8450321 mail at hellmutweber.de ----------------------------------------------