function kontrola() {
  var node = self.document.forms.shop;
		
	if (node.name.value == "") {
		node.name.focus();
		alert ("Please, fill in your first name and surname");
		return false;
		}

	if (node.email.value == "") {
		node.email.focus();
		alert ("Please, fill in your email");
		return false;
		}
		
	if (node.address.value == "") {
		node.address.focus();
		alert ("Please, fill in your address");
		return false;
		}
		
	if (node.city.value == "") {
		node.city.focus();
		alert ("Please, fill in city");
		return false;
		}
		
	if (node.zip.value == "") {
		node.zip.focus();
		alert ("Please, fill in postal code");
		return false;
		}
		
	if (node.country.value == "") {
		node.country.focus();
		alert ("Please, fill in country");
		return false;
		}
		
	return true;
}

function kontrola_guestbook() {
  var node = self.document.forms.post;
		
	if (node.name.value == "") {
		node.name.focus();
		alert ("Please, fill in your name");
		return false;
		}

	if (node.message.value == "") {
		node.message.focus();
		alert ("Please, fill in your message");
		return false;
		}

	if (node.question.value == "") {
		node.message.focus();
		alert ("Please, fill in antispam question");
		return false;
		}

	return true;
}