使用jquery.media.js插件
示例：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta content="IE=7.0000" http-equiv="X-UA-Compatible"/>
<title>pdf阅读</title>
<script type="text/javascript" src="pdfview_files/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="pdfview_files/jquery.media.js"></script>
<script type="text/javascript">
$(function () {
$('a.media').media({ width: 800, height: 800 });
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="main"><a class="media" href="xxx.pdf">pd文档</a></div>
</form>
</body>
</html>