window.getCurrency = function (currencyId) {
  return parseFloat(window.currencies[currencyId]);
}
window.updateCurrency = function (currencyId, newValue) {
  let spanId = "currency" + currencyId;
  let digits = 0;
  if(currencyId == 'au' || currencyId == 'ru') {
    digits = 2;
  }
  let valStr = newValue.toLocaleString(undefined, {minimumFractionDigits: digits});
  document.getElementById(spanId).innerHTML = valStr;
  window.currencies[currencyId] = newValue;
}
window.modCurrency = function (currencyId, addVal) {
  let newVal = addVal + getCurrency(currencyId);
  updateCurrency(currencyId, newVal);
}