function getDados(objForm) {
    var params = Array();
    for (i=0; i < objForm.elements.length; i++) {
        var parametro = encodeURIComponent(objForm.elements[i].name);
        parametro+= "=";
        parametro+= encodeURIComponent(objForm.elements[i].value);
        params.push(parametro);
    }

    return params.join("&");
}

function objXMLHttp() {
    var objetoXMLHttp;
    if (window.XMLHttpRequest) {
        objetoXMLHttp = new XMLHttpRequest();
        return objetoXMLHttp;
    } else if (window.ActiveXObject) {
        var versoes = ["Msxml2.XMLHttp.6.0","Msxml2.XMLHttp.5.0","Msxml2.XMLHttp.4.0","Msxml2.XMLHttp.4.0","Msxml2.XMLHttp","Microsoft.XMLHttp"];
        for (i=0; i< versoes.length; i++) {
            try  {
                objetoXMLHttp = new ActiveXObject(versoes[i]);
                return objetoXMLHttp;
            } catch (e) {
                //alert("ERRO: "+e);
            }
        }
        throw new Error("MSXML nao esta instalado");
        return false;
    }
}