Scripting Quicklook

Pressing “space” key shows a preview of a file in Leopard. But, to scroll down, mouse has to be used. Is there a way to scroll down using applescript so that mouse is not required to be used?
UIelement Inspector does not list any actions for scrolling.
Any ideas as to what i must try?

You can use the Function key (fn) + arrow up/down

Thanks Mark.