function showreport()
{
    $classname = $_GET['report'];
    $directory = "report/reports";
    $filename = "{$classname}.php";
    include_once "{$directory}/{$filename}";
    $class = new $classname();
    $data = $class->montar();
    #  var_dump($data);
    echo "<h1>Relatorio: {$class->titulo}</h1><br/>\n";
    echo "<a href=\"report/ods.php?report={$classname}\">ODS</a><br/>\n";
    echo "<a href=\"report/txt.php?report={$classname}\">TXT</a><br/>\n";
    $report = new Relatorio();
    $cabacalho = array();
    echo $report->montar($class->cabecalho, $data);
}