Oracle Forms

Hi,
I am trying to install standby database. I followed the steps
mentioned in the book for certification. I have two Oracle
databases (8.1.7) in the same machine. Both are working fine
individually. I tried to make db2 and db1's standby. I did :

1) Shutdown normal db1;
2) created stand by control file.
3) copied datafiles, standby controlfile, and archive logs of
db1 to the corresponding directory of db2.
4) startup nomount on db2.

I got an error saying :
ORA-01103 - Oracle database 'db1' in controlfile is not in 'db2'

Can anybody help me solving this problem ??

What will happen to existing controlfiles once I move stand by
controlfile to 'db2's directory. ??