I found this:
http://blogs.adobe.com/pdfdevjunkie/web_designers_guide

LastMitch
@Vincentas
Is there a simple way to just display the PDFs even forgoing a lot of the additional functionality those other services provide? Or perhaps a nice simple open-source version?
You just want to know how to open the pdf file from a browser?
Then just link it like this:
<a href="yourwebsite/yourfolder/your.pdf">My Pdf<a/>
so when someone click the link and it will open the pdf file in the browser.
Regarding about embeded:
<embed src="/path/yourfolder/your.pdf" />
It does the same thing.
or you can used Google Doc which has that feature:
http://googlesystem.blogspot.com/2009/09/embeddable-google-document-viewer.html