così:
<html>
<head>
<title>Untitled</title>
<style>
.filterOn {
border: 3px solid black;
cursor: hand;
filter: filter: blur(strength=50) shadow(); }
.filterOff {
border:2px red solid;
cursor: hand;
color: blue;}
</style>
</head>
<body>
[img]immagine.JPG[/img]
</body>
</html>