function validaEmail()
{
	d = document.getElementById("newsletter");
	var obj = d.news_email;
	var txt = obj.value;
	//validar E-mail
	if (txt == ""){
		alert("Por favor, preencha o campo 'E-mail'.");
		obj.focus();
		return false;
	} else {
		if ((txt.length != 0) && ((txt.indexOf("@") < 1) || (txt.indexOf('.') < 7)))
		{
			alert('Email inválido');
			obj.value = "";
			obj.focus();
			return false;
		}
	}
}