show them they can scrool

Hi

I have a site, that is basically a long one-page site, that is based on scrolling …

I however imagine that some will find it a bit hard to figure out that they can scroll down on the site (the clients are not all that used to using the internet) …

I want to keep it clean, so I’m looking for smart ways to make the users aware that they can scrool down, without actually writing it on the actual site it self ..

Is there any plugins, or otherwise easy ways, that etc. can show a 5 sec animation or otherwise demonstrate that they can scrool down?

As a sub question, are there any tablet plugins, that can make a similar animation (only when using tablets) – that shows them an advantage in turning the tablet? (not as important)…

Thnx
/Helio