Doubtfuls on a gallery

Hello to everyone,
I write you from Italy so...pardon for my english!
I've a problem with a gallery, I explain better...
I need a way for:
read the photos in n°x subdirectory and send the photos (with caption) in a flash file that will be the gallery.
Now I've do a script that read in my "Mother Directory" and read the sub director and the file inside them.
and now... I'm stopped!
How can I do?
I put here the code that I've do... but give an error!

function dir_reader($dir, &$images, &$subdirs) 
{
global $defdir;
if($dir != $defdir)
{
$dir = $defdir."/".$dir;
}
if ($handle = opendir($dir)) 
{		
while (false !== ($file = readdir($handle))) 
{
if ($file != "." && $file != "..") 
{
$filemane='a href="My_Gallery"';
list($filename, $ext) = explode(".", $file);
if(!is_dir($dir.'/'.$file)) 
{
if($ext == "jpg" || $ext == "jpeg")
{
$images[] = $dir."/".$file;
}
}
else
{
$subdirs[] = "<a href='?My_Gallery=".$file."'>".$file."</a>";
}
}
}
closedir($handle);
}
}

//Nome della cartella madre
$defdir = './My_Gallery';
if(!isset($_GET['My_Gallery']))
{
$dir = $defdir;
}
else
{
$dir = $_GET['My_Gallery'];
}
$images = array();
$subdirs = array();
dir_reader($dir, $images, $subdirs);
?>
<table border="2">
<tr>
<td>
<?php
// Da rivedere ciclo sull'array $subdirs
print("<pre>");
print_r($subdirs);
print("</pre>");
if(isset($_GET['My_Gallery']))
{
print("<a href='".$_SERVER['PHP_SELF']."'>indietro</a>");
}
?>
</td>
<td>
<?php
// Da rivedere ciclo sull'array $images per ottenere la gallery di immagini
print("<pre>");
print_r($images);
print("</pre>");
?>
</td>
</tr>
</table>

PHP:

Thanks to all and a Good day!