function abrirPag(valor){
var url = valor;

xmlRequest.open("GET",url,true);
xmlRequest.onreadystatechange = mudancaEstado;
xmlRequest.send(null);

/*if (xmlRequest.readyState == 1) {
document.getElementById("chamada").innerHTML = "<img src='../js/ajax-chamada/loader.gif'>";
}

return url;*/
}

function mudancaEstado(){
if (xmlRequest.readyState == 4){
document.getElementById("chamada").innerHTML = xmlRequest.responseText;
}
}