function cadastraNewsletter()
{
	var xhr;
	
	document.getElementById("mensagem").innerHTML = "Aguarde...";
	
	try
	{
		xhr = new ActiveXObject('Msxml2.XMLHTTP');
	}
	catch(e)
	{
		try
		{
			xhr = new ActiveXObject('Microsoft.XMLHTTP');
		}
		catch(e2)
		{
			try
			{
				xhr = new XMLHttpRequest();
			}
			catch(e3)
			{
				xhr = false;
			}
		}
	}
	  
	xhr.onreadystatechange = function()
	{
		if(xhr.readyState == 4)
		{
			if(xhr.status == 200) 
			{
				var resposta = xhr.responseText;
				
				if(resposta == "1")
				{
					document.getElementById("mensagem").innerHTML = "<img src='images/ico_erro.png' width='18' height='19' align='absmiddle' />&nbsp;&nbsp;Informe seu E-mail!";
					document.newsletter.email.focus();
				}
				
				else if(resposta == "2")
				{
					document.getElementById("mensagem").innerHTML = "<img src='images/ico_erro.png' width='18' height='19' align='absmiddle' />&nbsp;&nbsp;Seu E-mail parece estar incorreto!";
					document.newsletter.email.focus();
				}
				
				else if(resposta == "3")
				{
					document.getElementById("mensagem").innerHTML = "<img src='images/ico_erro.png' width='18' height='19' align='absmiddle' />&nbsp;&nbsp;Esse E-mail j&aacute; est&aacute cadastrado!";
					document.newsletter.email.focus();
				}
				
				else if(resposta == "0")
				{
					document.getElementById("mensagem").innerHTML = "<img src='images/ico_ok.png' width='18' height='19' align='absmiddle' />&nbsp;&nbsp;E-mail cadastrado com sucesso!";
					document.newsletter.email.value = "";
					
					tempoApagaMsg();
				}
			}
			else
			{
				document.getElementById("mensagem").innerHTML = "<img src='images/ico_erro.png' width='18' height='19' align='absmiddle' />&nbsp;&nbsp;Erro " + xhr.status;
			}
		}
	}; 

	xhr.open("POST", "newsletter.php", true);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");                  
	
	var dados = "email=" + document.newsletter.email.value;

	xhr.send(dados);
}

function tempoApagaMsg()
{
	setTimeout("apagaMsg()",10000);
}

function apagaMsg()
{
	document.getElementById('mensagem').innerHTML = "";
}