More than one Db on one SQL server

Im looking for information prior to designing a new dbase.

I'm running PostgreSQL 6.5.1 on a RH 6.0 166 w/128 Mb used as a db
server connected via unixODBC.

For the moment I have one database (small) which have been running for 4
months without any problems.

I would like to install another Db on the same server. Which way to go;
Running the new tables in under the same Db name or can I have a new Db
for the new tables without any complications or performance loss?

Thanks in advance,

Aage J. Skjolingstad