About creating a new DB

Hi,
I am trying to use postgreysql.
I am getting the following errors while creating a new database at
given location.
The errors are as shown below.

createdb -D /home/naren/ramu Ramu
ERROR: Absolute paths are not allowed as database locations
createdb: database creation failed

createdb -D ./../../ramu Ramu
ERROR: Relative paths are not allowed as database locations
createdb: database creation failed

So how should I give the path, so that it will create a database for
me at the given location??
with regards,
Ram