because i closed the ticket i add some comments here.
I managed to use PowerCMS on all pages in the site-directory.
After more practice i find out that with sub-directories on my site all the path-troubles are back again and i stil had a hard time finding out were to change code.
So i think at this very moment PowerCMS is not the right product for me.
I tried InContext Editing from Adobe and that is more appropriate for me.
Thanks for all the help anyway.