function isValidLoginDietaFormNewsletter(form) {
	var ErbckColor = "#F5FAFF";
	var CrbckColor = "#FFF";
	
	var email = form.email.value;
	var rE = /^[0-9a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;
	var mArr = email.match(rE);
	if (mArr == null) 
	{
		form.email.focus();
		form.email.style.background = ErbckColor;
		alert("Podany adres email jest nie poprawny.");
		return false;
	} else {
		form.email.style.background = CrbckColor;
	}
	
	form.submit();
}