//HTTP Request AjAX
function ObjAjax(){
	try{return new XMLHttpRequest()}
	catch(e){try{return new ActiveXObject("Msxml2.XMLHTTP")}
	catch(e){return new ActiveXObject("Microsoft.XMLHTTP")}}
	return null;
}

function nav(url){
	ajax = new ObjAjax;
	var div = document.getElementById("jax");
	
	ajax.onreadystatechange = function(){
		if(ajax.readyState == 1){div.innerHTML = "Carregando..."}
		if(ajax.readyState == 4){div.innerHTML = ajax.responseText}
		}
		
		ajax.open("GET",url,true);
		ajax.send(null);
}