function validar_recomendar1(form) {

	if (form.nombre.value == '') { alert('Indique su nombre.'); form.nombre.focus(); return false; }
	if (form.email.value.indexOf('@') < 0 || form.email.value.indexOf('.') < 0 || form.email.value.indexOf(',') > 0) { alert('Dirección de correo incorrecta.'); form.email.focus(); return false; }
	if (form.nombre_destinatario.value == '') { alert('Indique nombre destinatario.'); form.nombre_destinatario.focus(); return false; }
	if (form.email_destinatario.value.indexOf('@') < 0 || form.email_destinatario.value.indexOf('.') < 0 || form.email_destinatario.value.indexOf(',') > 0) { alert('Dirección de correo incorrecta.'); form.email.focus(); return false; }

	return true;

}

function validar_recomendar2(form) {

	if (form.nombre.value == '') { alert('Type your name'); form.nombre.focus(); return false; }
	if (form.email.value.indexOf('@') < 0 || form.email.value.indexOf('.') < 0 || form.email.value.indexOf(',') > 0) { alert('Bad email address.'); form.email.focus(); return false; }
	if (form.nombre_destinatario.value == '') { alert('Specify the sender name'); form.nombre_destinatario.focus(); return false; }
	if (form.email_destinatario.value.indexOf('@') < 0 || form.email_destinatario.value.indexOf('.') < 0 || form.email_destinatario.value.indexOf(',') > 0) { alert('Bad email address.'); form.email.focus(); return false; }

	return true;

}