function setPeriod(o) {
	var p = document.getElementById("periodCost");
	var a = document.getElementById("theLink1");
	var c = 0;
	if (o.price) c = parseInt(o.price);
	else c = o.price = parseInt(p.innerHTML);
	switch (o.name) {
		case "company":
			switch (o.value) {
				default: c = c * parseInt(o.value);
			}
			break;
	}
	p.innerHTML = c;
	a.href = a.href.replace(/%26period%3D.*/, "");
	a.href += "%26period%3D" + o.value;
}