I used that script too, bit I'm surprised it can still be used.
When I was using it I couldn't really use it for more than 1 torrent, which is why I wrote my own.
It has many more features… Especially automatic unrarring, shutting down when samba is busy, e-mails
You can download / install it by running the following commands:
mkdir -p /shares/internal/PUBLIC/Torrent/source
mkdir -p /shares/internal/PUBLIC/Torrent/work
mkdir -p /shares/internal/PUBLIC/Torrent/target
chown -R www-data:www-data /shares/internal/PUBLIC
[ ! -e S90optware ] && wget http://wd.mirmana.com/S90optware
chmod +x S90optware
chmod +x S90transmission
ln -s S90transmission K90transmission
chmod +x trans_watchdog
[ ! -e sendEmail ] && wget http://wd.mirmana.com/sendEmail
chmod +x sendEmail
[ `grep -c trans_watchdog /etc/crontabs/root` -eq 0 ] && echo -e "\n# Watch Tranmission every 5 minutes\n*/5 * * * * /usr/bin/trans_watchdog" >> /etc/crontabs/root