need help with applet calling another applet

[ninaijanai]

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JOptionPane;
import java.net.*;

public class User extends Applet implements ActionListener
{Label lblUser = new Label("Username:");
 Label lblPass = new Label("Password:");

 TextField fieldUser = new TextField("",10);
 TextField fieldPass = new TextField("",10);

 Button btnOk = new Button("OK");

 URL order;

 public void init()
 {add(lblUser); add(fieldUser);
  add(lblPass); add(fieldPass);
  add(btnOk);
  fieldPass.setEchoChar('*');
  try
   {order = new URL("c:/java/Order.html");
   }catch(MalformedURLException e){}
  btnOk.addActionListener(this);
 }

 public void actionPerformed(ActionEvent a)
 {String user,pass;
  if(a.getSource()==btnOk)
   {user=fieldUser.getText();
    pass=fieldPass.getText();
    if((user.equals("mcdonalds")&&pass.equals("jollibee"))||(user.equals("jollibee")&&pass.equals("mcdonalds")))
     {getAppletContext().showDocument(order);}
    else
     {JOptionPane.showMessageDialog(null,"Invalid Username/Password","Invalid",JOptionPane.ERROR_MESSAGE);}
    }
  }
}

my compiler tells me that there isn't any error with the code. but it still won't display the other applet.

WHAT SEEMS TO BE THE PROBLEM?:'(
can anyone help me with this?