function Nav(value){
	var url = "includes/js/portfolio.php";
	var valor = "valor="+value;
	if (window.XMLHttpRequest){
		req = new XMLHttpRequest(); 
		req.onreadystatechange = RetornaNav;
		req.open("POST",url,true);
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; iso-8859-1");  
		req.setRequestHeader("CharSet", "iso-8859-1")  
		req.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
		req.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");  
		req.setRequestHeader("Pragma", "no-cache"); 
		req.send(valor);
	}
	else if (window.ActiveXObject){
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req){
			req.onreadystatechange = RetornaNav;
			req.open("POST",url,true);
			req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; iso-8859-1");  
			req.setRequestHeader("CharSet", "iso-8859-1")  
			req.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
			req.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");  
			req.setRequestHeader("Pragma", "no-cache"); 
			req.send(valor);
		}
	}
}

function RetornaNav(){
	if(req.readyState == 4){
		if(req.status == 200){
			var texto = req.responseText;
			texto = texto.replace(/\+/g," ");
			texto = unescape(texto);
			var conteudo = document.getElementById("destaques");
			conteudo.innerHTML = texto;
		}
		else{
			window.alert("Houve um problema ao obter os dados:\n" + req.statusText);
		}
	}
}

function IE(){
	document.getElementById("alerta").style.display='none';
	document.getElementById("ie").style.display='none';
	window.open("http://blog.christianoerick.com/internet-explorer-e-mozilla-firefox");
}