function checkData(f)
{
	var Re = /^[0-9]+$/;
	if (!f.value.match(Re)) f.value = 0;
	was_changed = true;
}

function submitThis(f)
{
	var checks = f["checks[]"];
	if (!checks) return false;
	if (checks.value)
	{
		elementId = "items[" + checks.value + "]";
		if (f[elementId].value && f[elementId].value > 0)
			return confirm(confirm_string);
	}
	else
		for (i = 0; i < checks.length; i++)
		{
			elementId = "items[" + checks[i].value + "]";
			if (f[elementId].value && f[elementId].value > 0)
				return confirm(confirm_string);
		}
	alert(error_string);
	return false;
}

function Sum(id)
{
	priceId = "price[" + id + "]";
	itemId = "items[" + id + "]";
	summaId = "summa[" + id + "]";
	Forma[summaId].value=Forma[priceId].value*Forma[itemId].value;
}