CSS werkt niet meer

[Brentie1]

Hoi!
Ik ben bezig aan een nieuwe website, ik heb er voor betaald om de lay-out van habbogazette.fr te mogen gebruiken voor de website.
Als ging goed, tot gisteren. Plots verdween die css gewoon, er was geen opmaak of wat dan ook meer.
Hoe het nu is:

Als je naar habbogazette.fr, kijkt zie je hoe het moet zijn.
Hier de html van MIJN website:

<!--DOCTYPE html-->
<meta charset="UTF-8" />
<meta name="description" content="YabboFun, de Yabbos Fansite" />
<meta name="robots" content="all" />
<title></title>
<!-- Stylesheets -->
<link href="http://habbogazette.fr/site/wp-content/themes/ReturnOfHabboGazette/style.css" rel="stylesheet" media="all" charset="UTF-8" /> 		 		<!-- Javascript --> 		<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script> 		<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js"></script> 		<script src="//malsup.github.com/jquery.cycle.all.js"></script>
<link href="http://habbogazette.fr/site/css/ui-lightness/jquery-ui-1.8.11.custom.css" rel="stylesheet" /> 		 		<!-- Analytics --> 		<script type="text/javascript">
			var _gaq = _gaq || [];
			_gaq.push(['_setAccount', 'UA-28085444-1']);
			_gaq.push(['_setDomainName', 'habbogazette.fr']);
			_gaq.push(['_trackPageview']);

			(function() {
				var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
				ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
				var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
			})();
		</script>  		<script type="text/javascript" src="http://apis.google.com/js/plusone.js">
		  {lang: 'fr'}
		</script> 		 		<!-- Fix IE HTML5 behavior --> 		<!--[if lt IE 9]>
			<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
		<![endif]-->
<link title="HabboGazette ? Flux" href="http://habbogazette.fr/site/feed" rel="alternate" type="application/rss+xml" />
<link title="HabboGazette ? Flux des commentaires" href="http://habbogazette.fr/site/comments/feed" rel="alternate" type="application/rss+xml" />
<link id="validate-engine-css-css" href="http://habbogazette.fr/site/wp-content/plugins/wysija-newsletters/css/validationEngine.jquery.css?ver=2.1.5" rel="stylesheet" type="text/css" media="all" />
<link id="collapseomatic-css-css" href="http://habbogazette.fr/site/wp-content/plugins/jquery-collapse-o-matic/style.css?ver=1.5.2" rel="stylesheet" type="text/css" media="all" />
<link id="wp-polls-css" href="http://habbogazette.fr/site/wp-content/plugins/wp-polls/polls-css.css?ver=2.63" rel="stylesheet" type="text/css" media="all" />
<link id="lightboxStyle-css" href="http://habbogazette.fr/site/wp-content/plugins/lightbox-plus/css/red/colorbox.css?ver=2.0.2" rel="stylesheet" type="text/css" media="screen" /> <script type='text/javascript' src='http://habbogazette.fr/site/wp-includes/js/jquery/jquery.js?ver=1.7.2'></script> <script type='text/javascript' src='http://habbogazette.fr/site/wp-content/plugins/jquery-collapse-o-matic/collapse.min.js?ver=1.4.9'></script>
<link title="RSD" href="http://habbogazette.fr/site/xmlrpc.php?rsd" rel="EditURI" type="application/rsd+xml" />
<link href="http://habbogazette.fr/site/wp-includes/wlwmanifest.xml" rel="wlwmanifest" type="application/wlwmanifest+xml" />    <!-- Comment Rating plugin Version: 2.9.32 by Bob King, [url]http://wealthynetizen.com/[/url], dynamic comment voting & styling. -->  <style type="text/css" media="screen">
   .ckrating_highly_rated {background-color: #FFFFCC !important; padding: 0 4px;;}
   .ckrating_poorly_rated {background-color: #A11517 !important; padding: 0 4px; color: white;;}
   .ckrating_hotly_debated {background-color:#FFF0F5 !important; padding: 0 4px;;}
</style>  <style type="text/css">
.wp-polls .pollbar {
	margin: 1px;
	font-size: 8px;
	line-height: 10px;
	height: 10px;
	background-image: url('http://habbogazette.fr/site/wp-content/plugins/wp-polls/images/default_gradient/pollbg.gif');
	border: 1px solid #c8c8c8;
}
</style>
<div id="wrapper">
<header>
<a href="/index.htm"> 					<!--<img src="http://img594.imageshack.us/img594/6933/logo2bw.png" />--> 					<img alt="" src="http://img594.imageshack.us/img594/6933/logo2bw.png" /> 				</a> 				<nav>
<ul>
    <li> 							<a href="/home.htm">Home</a> 						</li>
    <li> 							<a href="/actueel.htm">Actueel</a> 						</li>
    <li> 							<a href="/fancenter.htm">Fancenter</a> 						</li>
    <li> 							<a href="/yabbos.htm">Yabbos</a> 						</li>
    <li> 							<a href="gidsen.htm">Gidsen</a> 						</li>
    <li class="search">
    <form action="home.htm" method="get">
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    </form>
    </li>
</ul>
</nav>
</header>
</div>
<div class="large-div landscape actualites">
<h2>Welkom op YabboFun!</h2>
<p> 		YabboFun is een fansite, van het bekende retro hotel Yabbos.nl!We proberen je zoveel mogelijk informatie en leukste tools aan te bieden. Naast onze tools en informatie hebben we ook een 'Gidsen' pagina. Hier vind je allerlei handige en leuke tips!Heb je problemen met iets, of blijf je zitten met een vraag?Aarzel niet, en neem contact met ons op op onze <a href="http://www.brent.woelmuis.nl/contact.htm">contact pagina</a>!Hier kan je natuurlijk ook met je klachten en/of tips terecht! 	</p>
<p> 		Have fun ! </p>
</div>
<div style="margin: auto; width: 941px; height: 403px;">  </div>
<div class="navibox home" id="navibox">  </div><div align="center">
<script type="text/javascript">
	<!--
	var _adynamo_client = "eae07f42-28dc-4289-a62f-92808c2ce824";
	var _adynamo_width = 300;
	var _adynamo_height = 20;
	//-->
</script>
<script type="text/javascript" src="http://static.addynamo.net/ad/js/deliverAds.js"></script>
</div>
<!-- Start of StatCounter Code for Dreamweaver -->
<script type="text/javascript">
var sc_project=7295936; 
var sc_invisible=1; 
var sc_security="ee708cde"; 
var scJsHost = (("https:" == document.location.protocol) ?
"https://secure." : "http://www.");
</script>
<script type="text/javascript"
src="http://www.statcounter.com/counter/counter.js"></script>
<noscript><div class="statcounter"><a title="counter on
tumblr" href="http://statcounter.com/tumblr/"
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src="https://c.statcounter.com/7295936/0/ee708cde/1/"
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Volgens mij is dit het css bestand?

MVG
BRENT