On a Web Page, How Do I...

-html goes here-
<?php
// get local directory path
$path= dirname($_SERVER['SCRIPT_FILENAME']);
?>
<h3>Files in <?php print $path; ?>:</h3>
<ul>
<?php
$d = dir($path);
while (false !== ($entry = $d->read())) {

    if ( substr($entry, 0, 1)=='.' ) continue;
    // find filename extension
    $dotpos = strrpos($entry, '.');

    if ($dotpos) {
        $ext = substr($entry, $dotpos+1);   
    }
    print "<li><a href='$entry'>$entry</a></li>\n";   
}
$d->close();
?>
</ul>
-more html-