<form action="http://webclap.simplecgi.com/clap.php?id=sample" method="post" target="_blank">
<script language="JavaScript">
var OnImage = new Array(
'http://〜',
'http://〜');
var OffImage = new Array(
'http://〜',
'http://〜');
var n = Math.floor (Math.random () * OnImage.length);