var xmlHttp

function mostraNews(nome,email){ 
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	 {
	 alert ("Seu navegador não suporta essa requisição.")
	 return
	 }

	if(nome == ""){
		alert("O campo nome deve ser preenchido!");
		document.newsletter.nomeNews.focus();
		return false;
	}
	
	if (email == ""){
		alert("O campo e-mail deve ser preenchido!");
		document.newsletter.emailNews.focus();
		return false;
	}
	
	parte1 = document.newsletter.emailNews.value.indexOf("@");
	parte2 = document.newsletter.emailNews.value.indexOf(".");
	parte3 = document.newsletter.emailNews.value.length;
	if (!(parte1 >= 3 && parte2 >= 6 && parte3 >= 9)) {
		   alert ("O campo e-mail deve ser válido!");
		   document.newsletter.emailNews.focus();
		   return false;
	}

	var url="newsletter.php"
	url=url+"?nome="+nome
	url=url+"&email="+email
	xmlHttp.onreadystatechange=stateChanged 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChanged(){ 
	if(xmlHttp.readyState == 1){
		document.getElementById("txtHint").innerHTML = 'Aguarde...';
	} else {		
		if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
		 { 
		 document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
		 } 
	}
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}