tomtomand

I’ve managed to fix the problem myself now.
Thanks for telling me where to look!

I removed the bold letter in this line:
<?php if ( is_archive() || is_search() ) : // Only display excerpts for archives and search. ?>

It made wordpress ignore to shorten the posts.

Now I’ve followed your instructions.

It made the archives listing look as I wanted it, but it messed up the postings in the ordinary blog. Now there is no pictures there instead. ??

(I changed it back)