Hallo Jürgen,
etwas mit dem Source gespielt und es funktioniert bei mir.
Liebe Grüße,
Bernd
<!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" xml:lang="de" lang="de">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Test Zentrieren</title>
<style type="text/css">
ul {
list-style: none;
}
ul li {
margin: 0 12px 12px 0;
padding: 0;
width: 230px;
height: 230px;
border:1px solid black;
float: left;
text-align: center;
font-size: 230px;
vertical-align: top;
}
ul li span {
display: table-cell;
vertical-align: middle;
width: 230px;
height: 230px;
}
ul li img { vertical-align: middle; border: none; }
</style>
</head>
<body>
<h1>Test Zentrieren</h1>
<ul>
<li><span><a href="#"><img src="P1000615.jpg" alt="" /></a></span></li>
<li><span><a href="#"><img src="P1000616.jpg" alt="" /></a></span></li>
<li><span><a href="#"><img src="P1000615.jpg" alt="" /></a></span></li>
<li><span><a href="#"><img src="P1000616.jpg" alt="" /></a></span></li>
</ul>
</body>
</html>