function checkLogin(msgLogin, msgPassword) {
	var obj = document.FRM_MembersLogin;
	if (isStringInRange(obj.user.value, 1, 30) == false) goAlert(msgLogin, obj.user);
	else if (isEmpty(obj.pwd.value) || isStringInRange(obj.pwd.value, 1, 30) == false) goAlert(msgPassword, obj.pwd);
	else obj.submit();
}

function goAlert(msg, field) {
	alert(msg);
	field.focus();
}