function HandleM2MOptions ($pagename, $auth='read') {
global $M2MDataDir, $M2MDir, $M2MUrl;
$formats = WikiConverterFactory::availableTargetFormats();
$targetformat = $_REQUEST['targetformat'];
// read default options
$options = new StylesheetOptions();
$options->readXML("$M2MDir/options/$targetformat.xml");
$datadir = "$M2MDataDir/$pagename";
if (file_exists("$datadir/{$targetformat}opt.xml"))
$options->readXML("$datadir/{$targetformat}opt.xml");
print "<html><head><title>media2mult options</title>";
print "<link rel='stylesheet' type='text/css' href='$M2MUrl/options/options.css'>";
print "<body>";
OptionPage::showForm($options, $formats[$targetformat], "$_SERVER[PHP_SELF]?n=$pagename&action=m2m-saveoptions", 3);
print "</body></html>";
}