Bernd, did Arthur's example do the trick for you? If so, do not forget to come back to the thread and use the Accept as Solution button on his post to give him credit for the help and let others know it did work. If you are still working on things, leave an update.
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.