You will need the following script:
anyScrollScene
And this is the code mentioned in the tutorial:
When you only want to scroll down:
anyScrollScene(hypeDocument,"enable",0.5,"start");
When you only want to scroll in both directions:
anyScrollScene(hypeDocument,"enable",0.5);
When you only want to scroll up:
anyScrollScene(hypeDocument,"enable",0.5,"end");
When you don't want a scene so scroll:
anyScrollScene(hypeDocument,"disable");