thanks for the reply. it was a "tinking error" on my side :-) - I got an idea from another side - without body margins, only with page margins - the left an right side I can choose in my reader... I'll test it with left / right 0 and only with bottom/top margin, how the reader shows me the file...
also thanks for your idea. I have the empty paragraphs for a little makro in word, what deletes the indent of a paragraph after a empty line when I fomat the whole text with indent. but its worth to think about - of course I know the possibility to set a bottom space :-)
I think I know what you desire - a "cleaning makro" of exactly the things you spoke about when saving the book - also a nice solution...