int npcId = npc.getNpcId();
int cond = st.getCond();
if(npcId == STONES && cond == 17)
{
st.playSound(SOUND_MIDDLE);
st.takeItems(DETECTOR, 1);
st.giveItems(DETECTOR2, 1);
st.setCond(18);
player.sendPacket(new ExShowScreenMessage("The radio signal detector is responding. A suspicious pile of stones catches your eye.", 4500, ScreenMessageAlign.TOP_CENTER));
}
return "";