function check_form_frases(formulario) {	
	with (formulario) {
		if (validarEmail(formulario.email_txt) == false) {
			formulario.email_txt.focus();
			if (formulario.lang.value == 'en')
			{
				alert('Please type a valid e-mail address');
			} else {
				alert('Por favor digite um e-mail válido');
			}
			return false;
		}
	}
	loadYoutag("frase");
	return false;
}