Trade gold function

function tradeGold(goldAmount, itemId, itemAmount, itemDamage) {
    //your code (add item and remove the gold)
    var playerGoldAmount;
    for(var i = 0; i <= 36; i++) {
        if(Player.getInventorySlot(i) == 266) {
            playerGoldAmount = playerGoldAmount + Player.getInventorySlotCount(i);
        }
    }
    if(playerGoldAmount >= goldAmount) {
        Player.addItemInventory(266, -goldAmount, 0);
        Player.addItemInventory(itemId, itemAmount, itemDamage);
    } else {
        clientMessage(ChatColor.RED + "You need " + Math.floor(goldAmount - playerGoldAmount) + " more gold to trade!");
    }
}