function order_server_set_sale(sale_element) {
	var base = '/strefa-klienta/koszyk/add/';
	var pattern = new RegExp(base + '([a-z]+)(-[0-9]+)?$');
	var form = document.getElementById('buyDomainsForm');
	var parts = new Array();
	var server = '';
	var sale = '';
	var new_action = '';
	if (!form) {
		return;
	}
	parts = form.action.match(pattern);
	if (parts == null || !parts || parts[1] == null || !parts[1]) {
		return;
	}
	server = parts[1];
	sale = sale_element.value;
	if (sale) {
		new_action = base + server + '-' + sale;
	} else {
		new_action = base + server;
	}
	form.action = new_action;
}