<!DOCTYPE html>
<html>
<head>
<style>p { color:red; }</style> <script type="text/javascript" src="/jquery/jquery.js"></script>
</head>
<body>
<form method="post" action="">
<fieldset>
<div>
<label for="two">2</label>
<input type="checkbox" value="2" id="two" name="number[]">
</div>
<div>
<label for="four">4</label>
<input type="checkbox" value="4" id="four" name="number[]">
</div>
<div>
<label for="six">6</label>
<input type="checkbox" value="6" id="six" name="number[]">
</div>
<div>
<label for="eight">8</label>
<input type="checkbox" value="8" id="eight" name="number[]">
</div>
</fieldset>
</form>
<p><b>Values: </b></p>
<script>
$("p").append($(':checkbox').map(function() { return this.id;
}).get().join(','));</script>
</body>
</html>