query using JDBC with postgresql

I have used JSP with oracle . so i prefer to use JSP with postgresql. I
have configured the JDBC driver for oracle .Is it ok if i use the same
for POSTGRESQL or should i use configure, download and install a
seperate JDBC drive for that?? If so which drive should i use??iam using
postgresql 8.1.4. The already configured jdbc is jdk 1.5. which JDBC
driver version should i use for this.how do i install, configure it and
use the driver. should i also include tomcat configuration with this?
how do i change the postgresql.conf file.
   We have netbeans IDE to work with java . oracle. can the same IDE be
used for postgresql.
   your answer will be really helpful
 
 Thanks and regards
 subha.N
 

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