[PHP] Probleme sur ma playlist

<?php
 
function index()
{
echo "<table width=\"100%\" valign=\"top\">

<tr><td><img src=\"themes/images/playlist.gif\" border=\"0\" alt=\"-- Playlist --\"/></td></tr>
<tr><td width=\"690\" height=\"480\">
<object type=\"application/x-shockwave-flash\" data=\"player-viral.swf\" width=\"690\" height=\"480\">	
<param name=\"movie\" value=\"player-viral.swf\">		
<param name=\"allowfullscreen\" value=\"true\" />	
<param name=\"allowscriptaccess\" value=\"always\" />
<param name=\"flashvars\" value=\"playlist_url=playlist.php?op=playlist&backcolor=DDDDDD&frontcolor=000000&lightcolor=AAAAAA&playlistsize=460&playlist=top&autostart=true&repeat=list&shuffle=false\" />
</td></tr></table>";
}
function playlist()
{
echo "<playlist>
<trackList>";

$dir = opendir('playlist');
while ($file = readdir($dir)) {
if (preg_match('/[.]mp3/', ' . $file . ')) {

echo "<track>
<location>playlist/'" . $file . "'</location>
<annotation>" . $file ."</annotation>
</track>
</trackList>
</playlist>";
		}
	}
}
switch ($op)
    {
        case "index":
            index();
            break;
			
		case "playlist":
            playlist();
            break;
			
		default:
            index();
            break;
    }

?>

Configuration: Windows Vista
Firefox 3.5.7