are there any ADOBE PDF addins?

[news.rcn.com]

I am working on a site using shared boarders. I have some adobe PDF files I
need to bring up on my site - but I want to maintain the shared boarders
when I open these files. As it stands - now - the adobe files open up and
take over the whole page. All my shared boarders are lost.

Is there a technique or a plugin that allows me to open up a PDF file IN the
webpage?

Thanks!

Bob