Load New JFrame from different class

Hi, Im making an application that has a login jframe when it loads. If they login with the right info, I want the login jframe to dissapear, and I want the main menu jframe to open...
The login jframe is: FearlessUI.java
The menu jframe is MainMenu.java
Anybody know the code to do so?

Here is the code of MainMenu.java:
* MainMenu.java
* Created on December 19, 2006, 6:25 PM
package my.FearlessForce;
public class MainMenu extends javax.swing.JFrame {
    /** Creates new form MainMenu */
    public MainMenu() {
        initComponents();
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        pack();
    }// </editor-fold>
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainMenu().setVisible(true);
    // Variables declaration - do not modify
    // End of variables declaration
}

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{code}
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>
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