Experience Eliminator

class npc_xp : public CreatureScript
{
   public:
       npc_xp() : CreatureScript("npc_xp") { }

       bool OnGossipHello(Player* player, Creature* creature)
       {
           player->ADD_GOSSIP_ITEM(GOSSIP_ICON_CHAT, "I no longer wish to gain experience.", GOSSIP_SENDER_MAIN, GOSSIP_ACTION_INFO_DEF+1);
           player->ADD_GOSSIP_ITEM(GOSSIP_ICON_CHAT, "I wish to start gaining experience again.", GOSSIP_SENDER_MAIN, GOSSIP_ACTION_INFO_DEF+2);
           player->ADD_GOSSIP_ITEM(GOSSIP_ICON_CHAT, "Nevermind", GOSSIP_SENDER_MAIN, GOSSIP_ACTION_INFO_DEF+3);
           player->SEND_GOSSIP_MENU(1, creature->GetGUID());
           return true;
       }

       bool OnGossipSelect(Player* player, Creature* creature, uint32 sender, uint32 actions)
       {
           if (player->IsInCombat())
           {
               player->CLOSE_GOSSIP_MENU();
               creature->MonsterWhisper("You're in combat", player->GetGUID());
               return true;
           }

           if (sender == GOSSIP_SENDER_MAIN)
           {
               switch(actions)
               {
                   case GOSSIP_ACTION_INFO_DEF+1:
                       {
                           player->SetFlag(PLAYER_FLAGS, PLAYER_FLAGS_NO_XP_GAIN);
                           creature->MonsterWhisper("You will no longer gain experience.", player->GetGUID());
                       }
                       break;

                   case GOSSIP_ACTION_INFO_DEF+2:
                       {
                           player->RemoveFlag(PLAYER_FLAGS, PLAYER_FLAGS_NO_XP_GAIN);
                           creature->MonsterWhisper("You will gain experience again.", player->GetGUID());
                       }
                       break;

                   case GOSSIP_ACTION_INFO_DEF+3:
                       {
                           player->PlayerTalkClass->SendCloseGossip();
                       }
                       break;
               }
           }

           return true;
       }
};

void AddSC_npc_xp()
{
    new npc_xp;
}