various mysql-databases in one .gz

[harp]

Hi, i found a very nice script to backup one of my mysql-databases:

#!/bin/sh
DIR="/usr/home/myname/backup"
DATUM=`date '+%d%m%Y-%H%M%S'`
mysqldump -u username -ppassword -h my.server.com --opt databse | gzip -c -9 > $DIR/backup-$DATUM.sql.gz
find $DIR/backup*.sql.gz -name \*.sql.gz -mtime +5 -exec rm {} \;

It´s nice for me, because it´s rather short and i like the fact, that it dumps the database and zips it in one step.

Can somebody tell me an easy way to make it work for more than one mysql-database, one different servers with different credentials, and wrap it all up in one .gz?

regards
HarP