// JavaScript Document
var xmlhttp = getXmlHttpRequest();
var d=document;

function getXmlHttpRequest() {
	if (window.XMLHttpRequest) {
		return new XMLHttpRequest(); } 
		
		else if (window.ActiveXObject) {
		return new ActiveXObject("Microsoft.XMLHTTP"); 
	}
}


function newsletter(){
		var email = document.getElementById('email').value;

		if (email == ""){
			alert("O e-mail no newsletter deve ser preenchido!");
			document.getElementById('email').focus();
			return false;
		}
		
		//validar email(verificao de endereco eletronico)
		parte1 = email.indexOf("@");
		parte2 = email.indexOf(".");
		parte3 = email.length;
		if (!(parte1 >= 3 && parte2 >= 6 && parte3 >= 9)) {
			alert("O campo e-mail deve ser conter um endereço eletronico valido!");
			document.getElementById('email').focus();
			return false;
		} 

		xmlhttp.open("GET", 'cadastra_email.php?email='+email, true);
		xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
		xmlhttp.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		xmlhttp.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");
		xmlhttp.setRequestHeader("Pragma", "no-cache");

		xmlhttp.onreadystatechange = function() {
		
		   if (xmlhttp.readyState==1) {
				d.getElementById("boxNewsletterInterno").innerHTML = "<div algin='center'><img src='imagens/carregando.gif' /></div>";
		   }
		
		   if (xmlhttp.readyState==4) {
			 if(xmlhttp.status == 200) {
	
				d.getElementById("boxNewsletterInterno").innerHTML = xmlhttp.responseText;
				}
				
			else {
				d.getElementById("boxNewsletterInterno").innerHTML = "Erro:" + xmlhttp.status;
			}	
		   }
		  }	
		xmlhttp.send(null);
}