Is it possible that when you have a webpage, when you open the PDF, the file view is defaulted to 100% size?
Thanks.
Use the Open Parameters for Acrobat PDF.
<a href="/path/to/doc.pdf#zoom=100">PDF Link</a>
Specifying PDF Open Parameters in a URL has a few more examples of other behavior you can specify, and also links to the pdf that tvanfosson references.