<!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>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css">
.cbox{display:block;width:16px;height:16px;border:1px solid #ccc;background:#fff;}
.cbox.checked{background:#f00;}
.cbox.checked:after{content:"√"}
</style>
<script type="text/javascript"></script>
</head>
<body>
<span class="cbox" onclick="this.className=/checked/ig.test(this.className)?this.className.replace('checked',''):(this.className+' checked')">
</span>
</body>
</html>
