// check feedback form
function check_feedback(form) {
	if (form.name.value == "") {
		alert("Введите ваше имя");
		form.name.focus();
		return false;
	}
	if (form.email.value == "") {
		alert("Введите e-mail");
		form.email.focus();
		return false;
	}
	var re = new RegExp("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$","ig");
	var arr = re.exec(form.email.value);
	if (arr == null) {
		alert("Введите корректный e-mail");
		form.email.focus();
		return false;
	}
	if (form.subject.value == "0") {
		alert("Выберите тему из списка");
		form.subject.focus();
		return false;
	}
	if (form.text.value == "") {
		alert("Введите текст сообщения");
		form.text.focus();
		return false;
	}
	return true;
}

// check eng feedback form
function check_eng_feedback(form) {
	if (form.name.value == "") {
		alert("Enter your name");
		form.name.focus();
		return false;
	}
	if (form.email.value == "") {
		alert("Enter e-mail");
		form.email.focus();
		return false;
	}
	var re = new RegExp("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$","ig");
	var arr = re.exec(form.email.value);
	if (arr == null) {
		alert("Enter correct e-mail");
		form.email.focus();
		return false;
	}
	if (form.subject.value == "0") {
		alert("Select subject from the list");
		form.subject.focus();
		return false;
	}
	if (form.text.value == "") {
		alert("Enter message text");
		form.text.focus();
		return false;
	}
	return true;
}