Revisa cosas como estas, que ya no deben ser mas localhost
<link rel="stylesheet" type="text/css" media="screen" href="http://localhost/niftyCorners.css" />
<script type="text/javascript" src="http://localhost/niftycube.js"></script>
<div class="topContent"><div id="attachment_47" class="wp-caption alignleft" style="width: 110px"><img class="size-thumbnail wp-image-47" title="kurt cobain" src="http://localhost/archivos/2009/06/4-100x80.jpg" alt="Nirvana - Kurt Cobain" width="100" height="80" /><p class="wp-caption-text">Nirvana - Kurt Cobain</p></div>