function valid_pytanieDoBiura(form)
{
	if(!checkEmail(form.pole_2.value) && form.kontakt_pole_4.checked){	
		alert("Prosze podac poprawnie adres email");
		return false;
	}
	if(!checkPhone(form.pole_6.value) && form.kontakt_pole_5.checked){	
		alert("Prosze podac poprawny numer telefonu");
		return false;
	}
	if(form.pole_3.value == ''){
		alert("Prosze wypelnic pole z trescia");
		return false;
	}

	return true;
}
function checkEmail(mail) {	
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(mail);
}
function checkPhone(phone) {	
	var filter = /^(\+|00|0)?([0-9]{2})?(-|[0-9]){9,20}$/;
	return filter.test(phone);
}