<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<script type='text/javascript' src='jquery-1.4.2.min.js'></script>
<fieldset>
<legend>第一組
<input type="checkbox" id="aa" onClick="$('input:checkbox.c1').attr('checked',$('#aa').attr('checked'))">全選</legend>
<input type="checkbox" name="pic[]" value="1" class="c1">選項 1
<input type="checkbox" name="pic[]" value="2" class="c1">選項 2
<input type="checkbox" name="pic[]" value="3" class="c1">選項 3
<input type="checkbox" name="pic[]" value="4" class="c1">選項 4
<input type="checkbox" name="pic[]" value="5" class="c1">選項 5
<input type="checkbox" name="pic[]" value="6" class="c1">選項 6
<input type="checkbox" name="pic[]" value="7" class="c1">選項 7
<input type="checkbox" name="pic[]" value="8" class="c1">選項 8
<input type="checkbox" name="pic[]" value="9" class="c1">選項 9
</fieldset>
</body>
</html>