How can I change the rman backup directory?

The whole system setup was from another guy before me and I have to maintain it. But something is not right and I need to fix it.

Oracle 10.2 running on Windows 2003.

 

This is the backup batch file rmanbackup_daily.bat file:

del L:\rmanbkp\control.bak

C:\oracle\Ora102\BIN\rman target sys/pwd NOCATALOG cmdfile=L:\networker_rman\backup_daily.rcv

This is the backup_daily.rcv file from the cmdfile above:

backup device type disk tag '%TAG' database include current controlfile;

sql 'alter database backup controlfile to trace';

backup as copy current controlfile format 'L:\rmanbkp\control.bak';