function changeSoftwareType(obj) {
	var value = obj.options[obj.selectedIndex].value;
	self.location.href = '/catalog/' + ((0 != value) ? '?TypeID=' + value : '');
	return true;
}

function validateOrder(form) {
	var order_list = new Array();
	var order_name = 'Order';
	var error = null;
	for (var i = 0; i < form.elements.length; i++) {
		var element = form.elements[i];
		if (('checkbox' == element.type) && (order_name == element.name.substring(0, order_name.length)) && (true == element.checked)) {
			order_list.push(element.name.substr(order_name.length));
		}
	}
	if (0 == order_list.length) {
		error = 'Не выбрано ни одной позиции для заказа';
	}
	if (error) {
		document.getElementById('error_message').innerHTML = error;
		return false;
	} else return true;
}