// Class names are always upper-case as in C / C++
Class 1 L2F_Delevel : L2FBaseNPC
{
parameter:
    // Parameters are always prefixed by what I'll be
    // using them for or what they hold.

    // HTML names are written: ServerName.NPCName.TitleOfPageOrFunction
    string htmlHello            = "L2F.Delevel.Hello.htm";
    string htmlChooseLevel      = "L2F.Delevel.ChooseLvel.htm";
    string htmlConfirmDelevel   = "L2F.Delevel.Confirm.htm";

    // Ask's are listed at 1k increments.
    // Sub-Asks remain within the same 1K range but
    // incremented by 100.
    int askChooseLevel      = 1000;
    int askConfirmLevel     = 1100;

    // Cookies
    string cookieDesiredLevel = "L2F.Delevel.DesiredLevel";

    // errors
    string errMsgInvalidCurrentLevel = "Your current level must be greater than the one selected.";
    string errMsgInvalidConformation = "You did not correctly confirm your delevel request.";

handler:

EventHandler TALKED(talker)
{
    myself.ShowPage(talker, htmlHello);
}

EventHandler MENU_SELECTED(talker, ask, reply, fhtml0, i0)
{
    // We use the AdvExt compiler which does not support using switch
    // statements with class constants. Have to use a bunch of if's here.
    // I don't think it's much slower as long as you return correctly.

    if (ask == askChooseLevel)
    {
        // Reply = The level they'd like to be set to
        // selected in HTML via dropdown or input box.

        // Player should not be able to select
        // a level greater or equal to their own.
        if (talker.level < reply)
        {
            myself.FHTML_SetFileName(fhtml0, htmlGlobalErrorPage); // Defined in L2FBaseNPC superclass.
            myself.FHTML_SetStr(fhtml0, "ERROR_TITLE", "L2F > Invalid Level Selected");
            myself.FHTML_SetStr(fhtml0, "ERROR_MSG", errMsgInvalidCurrentLevel);
            myself.FHTML_SetStr(fhtml0, "ERROR_REDIRECT_PAGE", htmlHello); // Location where the "OK" button sends you.
        myself.ShowFHTML(talker, fhtml0);
        return;
        }

        myself.SetCookie(talker, cookieDesiredLevel, reply);
        myself.ShowPage(talker, htmlConfirmDelevel);
        return;
    }

    if (ask == askConfirmLevel)
    {
        // Reply = The result of whatever you asked
        // them to input in the HTML to confirm they really
        // want to be deleveled.

        // Ensure the verification checks out.
        if (reply != YOUR_VERIFICATION_OPTION)
        {
            myself.FHTML_SetFileName(fhtml0, htmlGlobalErrorPage); // Defined in L2FBaseNPC superclass.
            myself.FHTML_SetStr(fhtml0, "ERROR_TITLE", "L2F > DeLevel Verification Failed");
            myself.FHTML_SetStr(fhtml0, "ERROR_MSG", errMsgINvalidConformation);
            myself.FHTML_SetStr(fhtml0, "ERROR_REDIRECT_PAGE", htmlHello);
        myself.ShowFHTML(talker, fhtml0);
        return;
        }

        // Everything went well, Set their level using the cookie we set earlier.
        return;
    }
}