Okay, that's done.
I added a new option with predefined PM replies. Problem was that you cannot use the $STRING with
and other html tags, even linebreaks between the quotes are not permitted. Now i solved it for the admin's or the groups i permit to get the predefined messages with one click.
p.s. didn't know that sendmessage.inc.php is not in use anymore (i guess) only mess_reply.inc.php
Thnx Yarp™