/**
 * KONTROLA ZDA BYLY VYPLNENY PRIHL. UDAJE
 * 
 */
function checkLogin(formular)
{
	if (formular.id.value == '') {
		alert('Váš login musíte vyplnit!');
		formular.login.focus();
		return false;
	}
	else if (formular.password.value == '') {
		alert('Vaše heslo musíte vyplnit!');
		formular.password.focus();
		return false;
	}
	else return doLogin(formular);
}


/**
 * HMAC HESLA
 *
 */
function doLogin(formular)
{
	if (formular.password.value.length > 0) {
		formular.passwordHmac.value = hex_hmac_md5(formular.challenge.value, hex_md5(formular.password.value));
		formular.password.disabled   = true;

		return true;
	}
	else {
		return false;
	}
}