Postgresql-JDBC connectivity

Hi...
I am novice user of Postgresql8.0.3. I managed to export the database
from sql server. We have all our application in JSP. I want to install
the org.postgresql.driver..
I completed the following steps...
1.Downloaded the jar file from http://jdbc.postgres.org
2. Copied it in the lib folder of Jakarta..
3. Edited the pages to use the Driver..am still not able to connect...

Where am I going wrong??
Minalac