I changed your code a bit and it worked for me:
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>Test</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<style type="text/css" media="all">
div table td font {
display: none;
}
a img {
filter: alpha(opacity=75);
-moz-opacity: 0.6;
opacity: 0.6;
-khtml-opacity: 0.6;
}
a:hover img {
filter: alpha(opacity=100);
-moz-opacity: 1.0;
opacity: 1.0
-khtml-opacity: 1.0;
width: 300px;
height: 225px;
}
#footer {
color: #999;
}
</style>
</head>
<body>
<a href="#"><img border="0" src="anyimage.jpg" alt="" /></a>
</body>
</html>