function checkAvailability(form) {
  var count = form.count.value;
  var stock = 0;
  if (typeof(form.A1) == 'undefined') { // without attribute
    stock = form.stock.value;
  } else {
    var index = form.A1.value;
    eval("stock = form.stock" + index + ".value;");
  }
  count = Number(count);
  stock = Number(stock);
  return count <= stock;
}
function getAvailability(form) {
  var stock = 0;
  if (typeof(form.A1) == 'undefined') { // without attribute
    stock = form.stock.value;
  } else {
    var index = form.A1.value;
    eval("stock = form.stock" + index + ".value;");
  }
  stock = Number(stock);
  return stock;
}