Oracle Database connectivity probem

hi Below is the code of oracle database connectivity, when i compile it, it will show the error: oracle.jdbc.driver.OracleDriver I am using netbeans 6.5 and tomcat 6.0 and jdk 1.6 i have also set the environment variable like that .;E:\oracle\ora81\jdbc\lib\classes12.zip;E:\oracle\ora81\jdbc\lib\ojdbc14.zip;C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar;E:\oracle\ora81\jdbc\lib\classes111.zip

I am trying to solve the problem from last three to four week but still not success and still try

Please help me asap. Thanks in advance

package firstexample;

import java.sql.*;

public class FirstExample {

public static void main(String[] args) {
try {
      Class.forName ("oracle.jdbc.driver.OracleDriver");
      Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@//rajesh-4d3ad07c/1521:Rajesh", "scott", "tiger");
      System.out.println("Connected");
      Statement stmt = conn.createStatement();

     // a select query
      ResultSet rset = stmt.executeQuery ("SELECT ename FROM emp");

while (rset.next()) {
System.out.println("ENAME = " + rset.getString(1));
}

rset.close();
stmt.close();
conn.close();

} catch (Exception e) {
System.out.println("ERROR : " + e.getMessage());
}
}
}