function valida_unsubscribe(){
	var errores = 0;
	var oEmail = document.getElementById('UnsubscribeMail');
	plant = /\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/i
	if (!plant.test(oEmail.value)) {
		document.getElementById('div_mail_unsubscribe_error').style.display = "block";
		errores++;
	}
	else{
		document.getElementById('div_mail_unsubscribe_error').style.display = "none";
	}
	
	if(errores > 0){
		return false;
	}
	
}