diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f26e9d9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+nbproject/private/
+build/
+dist/
\ No newline at end of file
diff --git a/nbproject/project.properties b/nbproject/project.properties
index 0ad604d..e99a9eb 100644
--- a/nbproject/project.properties
+++ b/nbproject/project.properties
@@ -53,7 +53,7 @@ javadoc.splitindex=true
 javadoc.use=true
 javadoc.version=false
 javadoc.windowtitle=
-main.class=com.nummethods.lr4.LR_4
+main.class=Main
 manifest.file=manifest.mf
 meta.inf.dir=${src.dir}/META-INF
 mkdist.disabled=false
diff --git a/src/Main.java b/src/Main.java
new file mode 100644
index 0000000..4201daa
--- /dev/null
+++ b/src/Main.java
@@ -0,0 +1,80 @@
+
+import java.awt.EventQueue;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Method;
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.UIManager;
+import javax.swing.WindowConstants;
+import javax.swing.border.EmptyBorder;
+
+/**
+ * Класс меню, запускающий лабораторные работы.
+ * @author aNNiMON
+ */
+public class Main extends JFrame {
+    
+    private static final int NUM_OF_LABS = 4;
+    
+    public static void main(String[] args) {
+        try {
+            for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
+                if ("Nimbus".equals(info.getName())) {
+                    UIManager.setLookAndFeel(info.getClassName());
+                    break;
+                }
+            }
+        } catch (Exception ex) {  }
+
+        EventQueue.invokeLater(new Runnable() {
+
+            @Override
+            public void run() {
+                new Main().setVisible(true);
+            }
+        });
+        
+    }
+
+    public Main() {
+        setTitle("Численные методы");
+        setResizable(false);
+        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+        
+        JPanel panel = new JPanel();
+        initPanel(panel);
+        
+        getContentPane().add(panel);
+        pack();
+        setLocationRelativeTo(null);
+    }
+
+    private void initPanel(JPanel panel) {
+        panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
+        for (int i = 1; i <= NUM_OF_LABS; i++) {
+            panel.add(createButton("Лабораторная работа №"+i, i));
+        }
+        panel.setBorder(new EmptyBorder(10, 10, 10, 10));
+    }
+    
+    private JButton createButton(final String text, final int num) {
+        JButton button = new JButton();
+        button.setText(text);
+        button.addActionListener(new ActionListener() {
+
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    // Вызов метода main динамически.
+                    Class<?> cls = Class.forName("com.nummethods.lr"+num+".LR_"+num);
+                    Method meth = cls.getMethod("main", String[].class);
+                    meth.invoke(null, (Object) null);
+                } catch (Exception cne) {}
+            }
+        });
+        return button;
+    }
+}
diff --git a/src/com/nummethods/lr3/LR_3.java b/src/com/nummethods/lr3/LR_3.java
index 902e0dc..5355aec 100644
--- a/src/com/nummethods/lr3/LR_3.java
+++ b/src/com/nummethods/lr3/LR_3.java
@@ -3,7 +3,6 @@ package com.nummethods.lr3;
 import java.awt.Dimension;
 import java.awt.geom.Point2D;
 import javax.swing.JFrame;
-import static javax.swing.JFrame.EXIT_ON_CLOSE;
 
 /**
  * @author aNNiMON
@@ -17,7 +16,7 @@ public class LR_3 extends JFrame {
     public LR_3() {
         super("LR_3");
         setBounds(300, 120, 0, 0);
-        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         
         Point2D[] input = new Point2D[] {
             new Point2D.Double(1, 2.0),
diff --git a/src/com/nummethods/lr4/LR_4.java b/src/com/nummethods/lr4/LR_4.java
index 5252e57..22f83a3 100644
--- a/src/com/nummethods/lr4/LR_4.java
+++ b/src/com/nummethods/lr4/LR_4.java
@@ -44,7 +44,7 @@ public class LR_4 extends JFrame {
     public LR_4() {
         super("LR_4");
         setBounds(300, 120, 0, 0);
-        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         
         SimpsonIntegrate simpson = new SimpsonIntegrate(var10);
         System.out.println( simpson.calculate(6) );