int npc_event_sub(struct map_session_data* sd, struct event_data* ev, const char* eventname)
{
	if ( sd->npc_id != 0 )
	{
		//Enqueue the event trigger.
		int i;
		ARR_FIND( 0, MAX_EVENTQUEUE, i, sd->eventqueue[i][0] == '\0' );
		if( i < MAX_EVENTQUEUE )
		{
			safestrncpy(sd->eventqueue[i],eventname,50); //Event enqueued.
			return 0;
		}

		ShowWarning("npc_event: player's event queue is full, can't add event '%s' !\n", eventname);
		return 1;
	}
	if( ev->nd->sc.option&OPTION_INVISIBLE )
	{
		//Disabled npc, shouldn't trigger event.
		npc_event_dequeue(sd);
		return 2;
	}
	run_script(ev->nd->u.scr.script,ev->pos,sd->bl.id,ev->nd->bl.id);
	return 0;
}