Boone, you’re my hero! It works!
I didn’t do the hack in the ajax.php now.
The result of your function is, that new blog posts are shown first and I have all options except “no filter”. Selecting “no filter” there are the new blog posts, too. This doesn’t matter for me, as I am going to delete the no-filter-option in the seletion-box.
I’m going to test the function completely this evening, but for the moment it looks pretty good!
Thank you very, very much!