Sub menuing in llDialog

It's got to the point where I wanna work on menus and submenus for my aircraft. I understand how to setup a simple menu using the llDialog but what puzzles me is how to break into a sub menu and then return from it using a back button. Moreso a sub-sub menu that gives me additional features such as issuing a command to change color, turn a certain thing on or of, or provide basic help. How would I go about writing code to drop into a sub and sub-sub menus, then have the option of going back from the sub-sub or back to the main itself?

To verify what I'm talking about.

1. Main Menu
   
2. Color
   
   
   
3. Wings
   
   
   
4. Color or custom
   
   
   
5. Body
   
   
   
6. Color or custom
   
   
   
7. Combat System
   
   
   
8. TCS (On/Off)
   
   
   
9. CCC (On/Off)
   
   
   
10. Autostart
    
    
    
11. On
    
    
    
12. Off
    
    
    
13. Start/Stop
    
    
    
14. Camera
    
    
    
15. Camera Positions
    
    
    
16. Eject
    
    
    

Basically that type of menu system except using buttons.

There's probably a smarter way out there, but what i do is putting the menu in a function or seperate script, then calling it using a state variables something like:

integer igHandler; //Listen handler

menu (integer ilState) {
  if (ilState == 0) {
    llDialog (llGetOwner (), "Main menu", ["Options"], 1);
  } else if (ilState == 1) {
    llDialog (llGetOwner (), "Options", ["Main"], 1);
  }
  if (igHandler)
    llListenRemove (igHandler);
  llListen (1, "", llGetOwner (), "");
}

default {
  touch_end (ilDetected) {
    if (llGetDetectedKey (0) == llGetOwner ()) {
      menu (0);
    }
  }

  listen (integer ilChan, string slName, key klId, string slData) {
    if (slData == "Options") {
      menu (1);
    else if (slData == "Main") {
      menu (0);
    llListenRemove (igHandler);
  }
}

NOTE: This has not been tested in any way - Use with caution