integer LINK_SIGNAL_GEN_CHANNEL     =   0601241;
integer LINK_SIGNAL_CHANNEL_BACK    =   0601242;
integer LINK_SIGNAL_SHOW_MENU       =   0601243;
integer LINK_SIGNAL_MENU_TIMEOUT    =   0601244;
integer LINK_SIGNAL_REREGISTER_MENUS=   0601245; 
integer LINK_SIGNAL_QUERY_MENU      =   0602241;
integer LINK_SIGNAL_REGISTER_MENU   =   0602242;
integer LINK_SIGNAL_RESET           =   0602243;
integer LINK_SIGNAL_MENU_DATA       =   0602244;
integer LINK_SIGNAL_MENU_BACK       =   0801241;
integer LINK_SIGNAL_REPLACE_BUTTON  =   0804241;


string PREVIOUS_MENU    = "<--";
string EXIT_MENU        = "-exit-";
string NEXT_MENU        = "-->";


string decodeLM(integer iSignal) {
    switch(iSignal) {
        case LINK_SIGNAL_GEN_CHANNEL: {
            return "LINK_SIGNAL_GEN_CHANNEL";
        }
        case LINK_SIGNAL_CHANNEL_BACK: {
            return "LINK_SIGNAL_CHANNEL_BACK";
        }
        case LINK_SIGNAL_SHOW_MENU: {
            return "LINK_SIGNAL_SHOW_MENU";
        }
        case LINK_SIGNAL_MENU_TIMEOUT: {
            return "LINK_SIGNAL_MENU_TIMEOUT";
        }
        case LINK_SIGNAL_REREGISTER_MENUS: {
            return "LINK_SIGNAL_REREGISTER_MENUS";
        }
        case LINK_SIGNAL_QUERY_MENU: {
            return "LINK_SIGNAL_QUERY_MENU";
        }
        case LINK_SIGNAL_REGISTER_MENU: {
            return "LINK_SIGNAL_REGISTER_MENU";
        }
        case LINK_SIGNAL_RESET: {
            return "LINK_SIGNAL_RESET";
        }
        case LINK_SIGNAL_MENU_DATA: {
            return "LINK_SIGNAL_MENU_DATA";
        }
        case LINK_SIGNAL_MENU_BACK: {
            return "LINK_SIGNAL_MENU_BACK";
        }
        default: {
            return (string)iSignal;
        }
    }
}

RegisterMenuButton(string sMenu, string sButton) {
    llMessageLinked(LINK_SET, LINK_SIGNAL_REGISTER_MENU, sButton, sMenu);
}

SetMenuPrompt(string sMenu, string sPromptText) {
    llMessageLinked(LINK_SET, LINK_SIGNAL_MENU_DATA, llList2Json(JSON_OBJECT, ["prompt", sPromptText]), sMenu);
}

showMenu(key kID, string sMenu, integer iPage) {
    llMessageLinked(LINK_SET, LINK_SIGNAL_SHOW_MENU, llList2Json(JSON_OBJECT, ["menu", sMenu, "page", iPage]), kID);
}

returnMenu(key kID, string sMenu, integer iPage, string sReply) {
    llMessageLinked(LINK_SET, LINK_SIGNAL_MENU_BACK, llList2Json(JSON_OBJECT, ["menu", sMenu, "page", iPage, "reply", sReply]), kID);
}

replaceMenuButton(string sMenu, string sButton, string sNewButton) {
    llMessageLinked(LINK_SET, LINK_SIGNAL_REPLACE_BUTTON, llList2Json(JSON_OBJECT, ["menu", sMenu, "btn", sButton, "newBtn", sNewButton]), "");
}