function ajax() {
   try {
      xmlhttp = new XMLHttpRequest();
   }
   catch(ee) {
      try {
         xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch(e) {
         try {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         }
         catch(E) {
            xmlhttp = false;
         }
      }
   }
   return xmlhttp;
}

// funçaõ do navegador
var myObj = new ajax();
function Navegador(direcao)
{	document.getElementById('navegador').innerHTML = "<center><img src='img/layout/loading.gif' alt='carregando'></center>"; 
	myObj.open("post","paginas/navegador.php",true);
	myObj.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	myObj.onreadystatechange=function()
		{
		if(myObj.readyState==4)
			{
			document.getElementById('navegador').innerHTML = myObj.responseText; 
			}
		}	
	if(direcao > 0){myObj.send("local="+direcao);}
	else{myObj.send(null);}
}