Efface tous ce que tu as dans slider.html et remplace tous par le code ci-dessous
<div id="featured" >
<ul class="ui-tabs-nav">
<li class="ui-tabs-nav-item ui-tabs-selected" id="nav-fragment-1"><a href="#fragment-1"><img src="<{xoImgUrl slider/images/image1-small.jpg}>" alt="" /><span>Gestion de contenu open source</span></a></li>
<li class="ui-tabs-nav-item" id="nav-fragment-2"><a href="#fragment-2"><img src="<{xoImgUrl slider/images/image2-small.jpg}>" alt="" /><span>Xoops Content Management System</span></a></li>
<li class="ui-tabs-nav-item" id="nav-fragment-3"><a href="#fragment-3"><img src="<{xoImgUrl slider/images/image3-small.jpg}>" alt="" /><span>Système dynamique de Gestion de Contenu</span></a></li>
<li class="ui-tabs-nav-item" id="nav-fragment-4"><a href="#fragment-4"><img src="<{xoImgUrl slider/images/image4-small.jpg}>" alt="" /><span>Xoops CMS</span></a></li>
</ul>
<!-- First Content -->
<div id="fragment-1" class="ui-tabs-panel" style="">
<img src="<{xoImgUrl slider/images/image1.jpg}>" alt="" />
<div class="info" >
<h2><a href="#" >eXtensible Object Oriented Portal System</a></h2>
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</div>
</div>
<!-- Second Content -->
<div id="fragment-2" class="ui-tabs-panel ui-tabs-hide" style="">
<img src="<{xoImgUrl slider/images/image2.jpg}>" alt="" />
<div class="info" >
<h2><a href="#" >eXtensible Object Oriented Portal System</a></h2>
<p>Vestibulum leo quam, accumsan nec porttitor a, euismod ac tortor. Sed ipsum lorem, sagittis non egestas id, suscipit....<a href="#" >read more</a></p>
</div>
</div>
<!-- Third Content -->
<div id="fragment-3" class="ui-tabs-panel ui-tabs-hide" style="">
<img src="<{xoImgUrl slider/images/image3.jpg}>" alt="" />
<div class="info" >
<h2><a href="#" >eXtensible Object Oriented Portal System</a></h2>
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</div>
</div>
<!-- Fourth Content -->
<div id="fragment-4" class="ui-tabs-panel ui-tabs-hide" style="">
<img src="<{xoImgUrl slider/images/image4.jpg}>" alt="" />
<div class="info" >
<h2><a href="#" >eXtensible Object Oriented Portal System</a></h2>
<p>Quisque sed orci ut lacus viverra interdum ornare sed est. Donec porta, erat eu pretium luctus, leo augue sodales....<a href="#" >read more</a></p>
</div>
</div>
</div>
</div>
Vérifie également que tes images soit bien dans XDCorporation/slider/images/