在 head 中决定 css 和 js 的加载

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<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>

<!-- CSS -->
<link href="style/css/style.css" rel="stylesheet" type="text/css" media="screen" />
<!--[if IE 6]><link rel="stylesheet" type="text/css" media="screen" href="style/css/ie6.css" /><![endif]-->
<!--[if IE 7]><link rel="stylesheet" type="text/css" media="screen" href="style/css/ie7.css" /><![endif]-->

<!-- JavaScripts-->
<script type="text/javascript" src="style/js/jquery.js"></script>
<script type="text/javascript" src="style/js/jNice.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script>
	!window.jQuery && document.write('<script src="jquery-1.4.3.min.js"></script>');
</script>

</head>

<body>

</body>
</html>