function isEmpty(elem) {
	return (elem.value == '');
}

function isEmail(email) {
	if(email && typeof email == 'object') email = email.value;

	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}

function checkPovprasevanje(f) {
	error = '';

	with(f) {
		if(isEmpty(ime)) {
			error += "Vnesite ime in priimek.\n";
		}

		if(isEmpty(eposta)) {
			error += "Vnesite email naslov.\n";
		}
		else {
			if(!isEmail(eposta)) {
				error += "Email naslov ni pravilen.\n";
			}
		}
	}

	if(error != '') {
		alert(error);
		return false;
	}

	return true;
}