//Función para enviar el formulario
function enviar_newsletter() {
	form = window.document.form_newsletter;
	if (validateFormNewsletter(form) == true) {
		form.submit();
	}
}

//Funcion para validar el formulario antes de enviarlo
function validateFormNewsletter(form)  {
  // validate txt_newsletter field
  // begin by stripping leading/trailing blanks
  form.txt_newsletter.value = stripLeadingTrailingBlanks(form.txt_newsletter.value);
  if (!isEmail(form.txt_newsletter.value)) {
    alert("Por favor, escriba una dirección de correo válida.");
    form.txt_newsletter.focus();
	poner_campo_rojo(form.txt_newsletter);
    return false;
  } else {
		poner_campo_verde(form.txt_newsletter);
  }
  
  
  // returning false causes the form data NOT to be submitted
  //alert("Congratulations: Your form has validated!");
  return true;  // form valid - submit to ACTION URL
}