Ken,
thank you, your last suggestion gave me a real success:
- the setting of imageloader was an empty Output template parameter. No idea why my second example based on settings in imageloader plug-in settings did not work before.....
- the {_imagelaoder... statements in the content text indeed hat that definition for the lightbox template.
So I added outputtemplate="plugins/content/imageloader/templates/highslidetemplate.txt
to my first and third imageloader example statement in the content text
No idea why my second example based on settings in imageloader plug-in settings did not work before.....
In the mean time I decided to create Joomla test site to have a clean environment (the other site was created with the Jupgrade utility, do not know what excactly was copied / transfered....):
joomlatest.familie-abderhalden.ch
So on my new test site the slide show is nearly how I want it.
Remaining problem: I want to see
only ONE picture / thumbnail to represent the slide show in the text.