function abrirPag(valor){
	
    var url = valor;

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

        if (xmlRequest.readyState == 1) {
            document.getElementById("conteudo_mostrar").innerHTML = "<br><img src='loader.gif'>";
        }

    return url;
}

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



function autentica(campo){

if(document.getElementById(campo).style.display == "")
	document.getElementById(campo).style.display = "none";
else
document.getElementById(campo).style.display = "";
//alert (valor);
//alert("teste");
return true;
}