function checkData(){
	if (document.form_news.newsletter.value != "") {
		if (document.form_news.newsletter.value.indexOf ("@",0) == -1 || document.form_news.newsletter.value.indexOf (".",0) == -1){
			alert("Preencha o ''E-MAIL'' corretamente!");
			document.form_news.newsletter.focus();
			return false;
		}
   	}
   	else{
		alert("Informe o ''E-MAIL''.");
		document.form_news.newsletter.focus();
		return false;
   	}
	return true;
}