Add switchToMainMenu method

src/com/annimon/turrets/GameCanvas.java

@@ -211,7 +211,7 @@ public class GameCanvas extends DoubleBufferedCanvas implements Runnable, Networ
                 socketHelper.close();
             } catch (IOException ex) { }
         }
-        Main.getInstance().switchLayout(Main.getInstance().getMainMenu());
+        Main.getInstance().switchToMainMenu();
     }
     
     private boolean allowMove() {

src/com/annimon/turrets/Main.java

@@ -40,8 +40,8 @@ public class Main extends JFrame {
         Sound.setEnabled(Prefs.getInstance().soundEnabled());
     }
     
-    public Component getMainMenu() {
+    public void switchToMainMenu() {
-        return mainMenu;
+        switchLayout(mainMenu);
     }
     
     public void switchLayout(Component component) {

src/com/annimon/turrets/OptionsPanel.java

@@ -106,7 +106,7 @@ public class OptionsPanel extends JPanel {
             
             final String ip = ipTextField.getText();
             if (validateIp(ip)) Prefs.getInstance().setLastIp(ip);
-            Main.getInstance().switchLayout(Main.getInstance().getMainMenu());
+            Main.getInstance().switchToMainMenu();
         }
     };
     
@@ -119,4 +119,4 @@ public class OptionsPanel extends JPanel {
         }
     }
 
-}
+};