servlet problem

Dear Sir/Madam,
Below i have written my environment
installed FreeBSD 4.5
installed JDK1.3.1
installed Tomcat 3.2
installed Postgresql 7.2.1
installed JDBC-Postgre driver and placed the pgjdbc.jar file in
/jdk1.3.1/jre/lib/ext
servlet.jar file was located in /usr/local/tomcat/lib/servlet.jar

i am the beginer for the java world and postgresql.i don`t know how to
compile and run the below servlet program
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;

public class Mypsql extends HttpServlet {
Connection conn;
Statement stmt;

//set the connection url,database username and password
String url = "jdbc:postgresql://localhost:5432/postgres";
String dbusername = "postgres";
String dbpass = "postgres";

public void init(ServletConfig config)throws ServletException{
super.init(config);
}

public void doGet(HttpServletRequest req, HttpServletResponse res)throws
ServletException, IOException{
res.setContentType("text/html");
PrintWriter out = res.getWriter();

try
{
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection(url,dbusername, dbpass);

stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT*FROM test1");

while(rs.next())
{
out.println(rs.getString(1)+ "<BR>");
}
}
catch(Exception e)
{
out.println(e);
}
}
}

i couldn`t find postgresql.jar file.
please any one help me !
Thanks in advance!
kumar