java redirect fails

I coded a java hack challenge for my site, the thing is that the program doesn't redirect to the appropriate page when the user decompiled the applet, and entered the right password…here's the source:

package hack_challenge;

import java.awt.*;
import java.net.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.BoxLayout;
import javax.swing.JPanel;
public class MyApplet extends java.applet.Applet {
    // components
    private JFrame frame;
    private JLabel jlbUser,jlbPass,jlbState;
    private JTextField jtfUser,jtfPass;
    private JButton jbnLogin;
    private Container cPane;
    public void init(){
        // make a frame, get the contentpane and set layout
        frame = new JFrame("..: login :..");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        cPane = frame.getContentPane();
        cPane.setLayout(new BoxLayout(cPane,BoxLayout.PAGE_AXIS));
        arrangeComponents();
        /*
        if(login()){
            try{
                getAppletContext().showDocument(new URL("../zZZZz.php?aAAAa=OK"),"_top");
            }
            catch (Exception e) {e.printStackTrace(); }
        }
        else{
            //
            setHelpText("..: login has failed :..");
            setUsername("");
            setPass("");
        }
        */
        frame.setSize(450,550);
        frame.setResizable(false);
        frame.setVisible(true);
    }
    /* getter and setter methods*/
    // username
    public String getUsername(){
        return(jtfUser.getText());
    }
    public void setUsername(String username){
        jtfUser.setText(username);
    }
    // password
    public String getPassword(){
        return(jtfPass.getText());
    }
    public void setPassword(String username){
        jtfPass.setText(username);
    }
    // help text, only set is relevant
    public void setHelpText(String username){
        jlbState.setText(username);
    }
    /* rangschikt componenten op het gebruikers interface */
    public void arrangeComponents(){
        /* panels */
        // hoofd panel
        JPanel panel_hoofd = new JPanel();
        // panel met invoer velden
        JPanel tekst_velden = new JPanel(new GridBagLayout());
        // panel met knoppen
        JPanel knoppen = new JPanel(new FlowLayout());
        panel_hoofd.add(knoppen);
        cPane.add(panel_hoofd);
        // labels(jlb*)
        jlbUser = new JLabel("username:");
        jlbPass = new JLabel("password:");
        // tekstvelden(jtf*)
        jtfUser = new JTextField(20);
        jtfPass = new JTextField(20);
        // knoppen(jbn*)
        jbnLogin = new JButton("Login");
        // alle componenten aan de panel toevoegen
        GridBagConstraints grid_0 = new GridBagConstraints();
        grid_0.gridx = 0;
        grid_0.gridy = 0;
        grid_0.insets = new Insets(5,5,5,5);
        tekst_velden.add(jlbUser,grid_0);

        GridBagConstraints grid_1 = new GridBagConstraints();
        grid_1.gridx = 1;
        grid_1.insets = new Insets(5,5,5,5);
        grid_1.gridy = 0;
        grid_1.gridwidth = 0;
        grid_1.fill = GridBagConstraints.BOTH;
        tekst_velden.add(jtfUser,grid_1);

        GridBagConstraints grid_2 = new GridBagConstraints();
        grid_2.gridx = 0;
        grid_2.insets = new Insets(5,5,5,5);
        grid_2.gridy = 1;
        tekst_velden.add(jlbPass,grid_2);

        GridBagConstraints grid_3 = new GridBagConstraints();
        grid_3.gridx = 1;
        grid_3.insets = new Insets(5,5,5,5);
        grid_3.gridy = 1;
        grid_3.gridwidth = 1;
        grid_3.fill = GridBagConstraints.BOTH;
        tekst_velden.add(jtfPass,grid_3);

        GridBagConstraints grid_4 = new GridBagConstraints();
        grid_4.gridx = 0;
        grid_4.insets = new Insets(5,5,5,5);
        grid_4.gridy = 2;
        tekst_velden.add(jbnLogin,grid_4);

        GridBagConstraints grid_5 = new GridBagConstraints();
        grid_5.gridx = 1;
        grid_5.insets = new Insets(5,5,5,5);
        grid_5.gridy = 2;
        grid_5.gridwidth = 1;
        grid_5.fill = GridBagConstraints.BOTH;
        tekst_velden.add(jlbState,grid_5);
        // voeg knoppen toe aan knoppen paneel
        knoppen.add(jbnLogin);
        }

    /* methods */
    // login
    /*
    public boolean login() {
        boolean userValid = false;
        //MyLogin login = new MyLogin(new Frame(""),p2);
        requestFocus();
        if(login.id){
          String user = login.username.getText();
          String pass = login.password.getText();
          return(validateUser(user,pass));
          }
        else{
          login.dispose();
          return(false);
        }
    }
    */
    // validate
    private boolean validateUser(String usr, String pwd) {
      return(usr.equals("***") && pwd.equals("*****"));
      }

}

It's obvious that I'm doing something wrong, ne1???

thnx in advance!