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Développement web côté serveur, CMS

Bug en php - pas d'affichage

hi everybody,
je débute en php. je viens de creer un script que j'ai uploadé sur mon serveur mais quand je tape l url rien ne s'affiche (page blanche)
voila mon code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr">
<head>
<title>Menu déroulant horizontal à plusieurs niveaux en DHTML</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Language" content="fr" />
    <meta name="Robots" content="follow" />
    <meta name="MSSmartTagsPreventParsing" content="TRUE" />
<!-- script du menu -->
<script type="text/javascript" src="lemenu.js"></script>
 <!-- détéction du navigateur -->
<script type="text/javascript" src="browserdetect.js"></script>
<style type="text/css">
    @import "lemenuH.css";
</style>
</head>
<body>
<?php
	// Sélecton de la table / Langue de la session
	/*
	if ($_SESSION['lang'] == 'fr') {
		$lang_table = '';
	} else {
		$lang_table = '_'.$_SESSION['lang'];
	}
	*/
	
	$root = $_SERVER['DOCUMENT_ROOT'];
	
	$lang_table = '';

	$dom = new DomDocument;
	$dom->preserveWhiteSpace = false;
	$dom->formatOutput = true;

	if ($dom->load($root."/xml/nav".$lang_table.".xml")) {
		$nav_root = $dom->documentElement;
		$nav_nb = $nav_root->childNodes->length;
		if ($nav_nb > 0) {
		//Niveau 1
			echo "<ul id=\"menu\">";
			foreach($nav_root->childNodes as $nav_node) {
				switch ($nav_node->getAttribute("type")) {
					case "advanced":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
					case "template":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";} 
						break;
					case "module":
						echo "<li><a href=\"".$nav_node->getAttribute("mod_link")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";
						break;
					case "other":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
					case "link":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"javascript:void();\" onclick=\"displayWindow('".$nav_node->getAttribute("url")."','Mailing Liste',".$nav_node->getAttribute("width").",".$nav_node->getAttribute("height").",'".$nav_node->getAttribute("features")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
			echo "</ul>";
		}
	}
		//Niveau 2			
			foreach($nav_root->childNodes as $nav_node) {
				if ($nav_node->hasChildNodes()) {
					echo "<ul>";
						foreach($nav_node->childNodes as $subnav_node) {
							switch ($nav_node->getAttribute("type")) {
								case "advanced":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
					case "template":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";} 
						break;
					case "module":
						echo "<li><a href=\"".$nav_node->getAttribute("mod_link")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";
						break;
					case "other":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"index.php?id=".$nav_node->getAttribute("id")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
					case "link":
						if ($nav_node->getAttribute("clic") == "1") {
							echo "<li><a href=\"javascript:void();\" onclick=\"displayWindow('".$nav_node->getAttribute("url")."','Mailing Liste',".$nav_node->getAttribute("width").",".$nav_node->getAttribute("height").",'".$nav_node->getAttribute("features")."\">".htmlentities($nav_node->getAttribute("text"), ENT_QUOTES, 'utf-8')."</a></li>";}
						break;
							}
						}
					echo "</ul>";
				}
			}
			echo "<script language=\"javascript\">initMenu();</script>";
?>
</body>
</html>


et l'url de mon fichier
si vous comprennez ce qui bug... Smiley confus
merci
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