PDF is a document format that requires Adobe's Reader to be installed in order to view the document.
Typically browsers have a plugin version of Adobe's PDF reader installed so that you can view PDF files within the browser.
The thing is that this is a plugin and it depends on the browser that your user is using.
I'm not sure how you would do this without using an iFrame element really....iFrames always make things complicated though.
This is how I see it working...
You will need to have an iFrame (instead of a Placeholder) on the page where you want the PDF to be displayed. An
iFrame defines an inline frame that contains another document...which pretty much means that it lets you have a "window" within another window. It lets you load a "web page"/document within another web page.
You will have to specify the URL to the PDF using the iFrame's "src" attribute.
Now the iFrame will load the PDF document from the URL that you specified...and it will display it where you have placed it in the page.
If the user does not have an Adobe Reader plugin installed in the browser will let the user download the document to their computer. This is because the browser does not know how to handle this type of data and so it lets the user decide what to do.
-Frinny