function check_register(forma) {
	var ok = true;
 
	if(forma.login.value.length < '3') {
		document.getElementById('error_login').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_login').style.display='none';
	}

	if(forma.haslo1.value.length < '4' || forma.haslo2.value.length < '4') {
		document.getElementById('error_haslo_len').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_haslo_len').style.display='none';
	}
	if(forma.haslo1.value != forma.haslo2.value) {
		document.getElementById('error_haslo_val').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_haslo_val').style.display='none';
	}

	if(forma.nazwa.value.length < '1') {
		document.getElementById('error_nazwa').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_nazwa').style.display='none';
	}

	if(forma.ulica.value.length < '2') {
		document.getElementById('error_ulica').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_ulica').style.display='none';
	}

	if(forma.numer.value.length < '2') {
		document.getElementById('error_numer').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_numer').style.display='none';
	}

	if(forma.miasto.value.length < '2') {
		document.getElementById('error_miasto').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_miasto').style.display='none';
	}

	if(forma.kod.value.length < '5') {
		document.getElementById('error_kod').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_kod').style.display='none';
	}

	if(forma.nip.value.length < '5') {
		document.getElementById('error_nip').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_nip').style.display='none';
	}

	if(forma.telefon.value.length < '1') {
		document.getElementById('error_telefon').style.display='block';
		ok = false;
	} else {
		document.getElementById('error_telefon').style.display='none';
	}

	if(forma.email.value.length > '0') {
		document.getElementById('error_email').style.display='none';

		var re = new RegExp("[^@]{1,}[@]{1}[^@.]{1,}[.]{1}[^@]{1,}","gi");
		var wynik = re.test(forma.email.value);
		if (wynik == false) {
			ok = false;
			document.getElementById('error_wrong_email').style.display='block';
		} else {
			document.getElementById('error_wrong_email').style.display='none';
		}
	} else {
		ok = false;
		document.getElementById('error_email').style.display='block';
	}

	if(ok==true) { return true; } else { return false; }
}