[ff7chocoboknight]

So, it should be this...?

//#SERVERSIDE
function onPlayerChats() {
  if (player.chat == "buy Juggling") {
     if (clientr.etcoins >= 30) {
        clientr.etcoins -= 30;
        addweapon ("*Prizes/Juggle");
     }
  }
  if (player.chat == "buy PK Heal") {
     if (clientr.etcoins >= 30) {
        clientr.etcoins -= 30;
        addweapon ("*Prizes/PK Heal");
    }
  }
  if (player.chat == "buy Jump") {
    if (clientr.etcoins >= 50) {
       clientr.etcoins -= 50;
       addweapon ("*Prizes/Jump");
    }
  }
    if (player.chat == "buy Light Mouse") {
     if (clientr.etcoins >= 150) {
        clientr.etcoins -= 150;
        addweapon ("*Prizes/Light Mouse");
    }
  }
}

It's what I sent him before, but without the //#SERVERSIDE