【insert】
<html>
<head>
<script type="text/javascript" src='http://code.jquery.com/jquery-1.5.2.js'></script>
<script type="text/javascript">
$(document).ready(function(){
$("p").insertBefore("#foo");
});
</script>
</head>
<body>
1 <div id="foo">b</div><p>a</p>2
</body>
</html>
