function mailValidator(){	
	var adres = document.forms.formb.email;
	if(emailValidator(adres, "Wpisz poprawny adres email")){
		return true;
	}										
	return false;
}

function emailValidator(elem, helperMsg){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z]{2,4}$/;
	if(elem.value.match(emailExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}