codice:
<!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>Documento senza titolo</title>
<style type="text/css">
<!--
#p1 {
	background: url(innagine.jpg) ;
	background-repeat: no-repeat;
	height: 40px;
	width: 120px;
	border: none;
	outline: none;
	cursor: pointer;
}
#p1:hover {
	background: url(innagine02.jpg);
}
-->
</style>
</head>

<body>
<form action="">
<input type="submit" id="p1" name="p1" value="" />
</form>
</body>
</html>