esempio funzionante:
codice:
<html>
<head>
<style type="text/css">
.spento{
color:#A0A0A4
}
.acceso{color:#0000FF}
</style>
<script type="text/javascript" language="JavaScript1.2">
function Classe()
{
var pul = document.getElementById("pulsante");
pul.className="acceso";
}
</script>
<link href="stile.css" type="text/css" rel="stylesheet">
</head>
<body bgcolor="#ffffff">
<form name="form1" method="post" action="">
<input name="Submit" type="button" class="spento" id="pulsante" onclick="Classe()" value="Invia">
</form>
</p>
</body>
</html>