var newsletterSubscriberFormDetail = new VarienForm('newsletter-validate-detail');
        newsletterSubscriberFormDetail.submit = function(){
                if (this.validator.validate()) {
                        var emailcerto = validaEmail("email");
                        if (emailcerto){
                                $('email').className = $('email').className.replace(" validation-failed","");
                                alert("Obrigado por assinar a nossa newsletter.");
                                this.form.submit();
                        }else{
                                $('email').className = $('email').className + " validation-failed";
                                alert("Por favor, preencha corretamente o e-mail para assinar a newsletter.");
                        }
                }else{
                        alert("Por favor, preencha corretamente o e-mail para assinar a newsletter.");
                }
}.bind(newsletterSubscriberFormDetail);