function principal(principal){
    var principal
	var url = principal;

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

        if (xmlRequest.readyState == 1) {
            document.getElementById("divView").innerHTML = "";
        }

    return url;
}

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