Scripts

first, here's how it should be:

local a = 0

it's better not to write anything outside of functions.
second, here's this line:

if prewOwner == PLAYER_NOON and newOwner == PLAYER_NAME

a neutral player is PLAYER_NONE. What is PLAYER_NAME, anyway? You need to use constant player numbers, for example, PLAYER_1.

also, in the definition of the zoloto function, you need to specify that it has the parameters prewOwner and newOwner:

function zoloto(prewOwner, newOwner)