connectivity problem

I am using postgreSQL 7.3,j2sdk1.4.2 and have
installed jdbc driver as pg73jdbc3.jar


Here is the classpath :
exportCLASSPATH=/root/j2sdk1.4.2/bin/test1.java:/root/j2sdk_nb/j2sdk1.4.2/jre/lib/ext/pg73jdbc3.jar:.

and here is the code:

import java.sql.*;
class test2{
  public static void main (String args[]) {


     try{


         Class.forName("org.postgresql.Driver");



      String
url="jdbc:postgresql//10.1.30.10:85/test";
      Connection con =
DriverManager.getConnection(url, "postgres", "");
      Statement stm= con.createStatement();


stm.setQueryTimeout(10);
ResultSet rs = stm.executeQuery("select col1 from
test1");


rs.next();


System.out.println(rs.getString(1));
}catch(ClassNotFoundException  e) {




 System.out.println("Exception");
 System.out.println(e.toString());
}
 catch(SQLException e) {




 System.out.println("Exception");
 System.out.println(e.toString());
}
}
}


and here is the error I receive :

Exception
java.sql.SQLException: No suitable driver



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