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