Well, på baggrund af den kode du har lavet på din test-side, er der her noget kode der validerer og fungerer:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="
http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Titel</title>
<link rel="stylesheet" href="
http://racingmedia.dk/css/test.css" type="text/css" />
<script src='
http://racingmedia.dk/jquery-1.2.6.js' type="text/javascript"></script>
<style type="text/css">
.boks a { width: 150px; padding: 20px; float: left; border: 1px solid #ccc; background: #f4f4f4; text-align: center; color: #666; text-decoration: none; }
.boks a:hover { border: 1px solid #666; color: #333; }
</style>
</head>
<body>
<ul id="hoverbox" class="list">
<li style="background: none; border: 0; margin: 0; padding: 0;">
<span class="boks"><a href="
http://www.news.com">lorem ipsum</a></span>
</li>
<li style="background: none; border: 0; margin: 0; padding: 0;">
<span class="boks"><a href="
http://www.news.com">lorem ipsum</a></span>
</li>
</ul>
</body>
</html>