Creating interactivity in PDF documents

Hi everyone,
I created my portfolio in pdf format in photoshop. It consisting of 8 pages. I want to have links on first introductory page. Instead of scrolling through the pages in Adobe reader I want to have the links to navigate through the pages when links are clicked like in html document. Is it possible to create links in pdf document to navigate through pages?..I have seen a pdf document of someone portfolio having this interactivity.
Any help please?