How to open a PDF file in a browser and implement a preview of ideas and code

In fact, it is simple to implement an open PDF file in the browser and have a border similar to the preview function.

In fact, often see similar pages on the Internet, open PDF documents in the browser, but most of the reasons for the use of copyright because of some very special technology, naturally difficult to imitate.
Even if you have an example that opens directly in the browser, you must manually click on the link before you can open the PDF file. How do I open it directly without clicking on the link?
I think I am very familiar with JS, also use JS analog click, but is not useful, no way, can only continue to look for information on the Internet. Finally, the code is very simple.
The main thing is to use a jquery plug-in jquery.media.js, the use of this plug-in is very easy to achieve.
Core code: