What version of InDesign? What kind of interactivity are you creating?
Be aware that some forms of interactivity do not work in Interactive PDF. Animations and Object States do not work.
You should be able to do buttons, page transitions, hyperlinks, bookmarks, media (video and audio if you choose the correct format).
There is a workaround for animations and object states: You can export them as a SWF file, then place them into the InDesign file and export PDF.
BTW, there is a lot of information in the InDesign Help file. Start there.
When exporting, did you check INTERACTIVE in the dialog box?
i've created buttons with a roll overs that display n image elsewhere on the page. this could be regarded as an animation so its probably why its not reflecting it within the pdf.
thanks for the help, i think i'm going to have to reconsider my approach.
It should work if you created Show/Hide buttons. Clicking a button would Show a second button.
What version of InDesign are you using? (You didn't answer. There can be many changes between versions.)