<select size="30" onchange="changeUrl1(this); changeUrl2(this);">
<?php
$files = array();
$dir = opendir('./video');
while(false != ($file = readdir($dir))) {
        if(($file != ".") and ($file != "..") and ($file != "index.html")) {
                $files[] = $file;
        }
}
$nbr_capta=count($files);
natsort($files);

foreach($files as $file) {
    $file=addslashes($file);
    $file2=stripslashes(str_replace('.mp4','',$file));

?>
    <option value="<?=$file?>"><?=$file2?></option>

<?php
}
?>
</select>

<script type="text/javascript">
      function changeUrl1(selectObject) {
        var value = selectObject.value;
        document.getElementById('video').src='video/'+value;
        }
      function changeUrl2(selectObject) {
       var value = selectObject.value;
        document.getElementById('titre').innerHTML=value;
      }
</script>