Is it possible to scroll the listbox manually?

[Xorcist]

I'd like to specify an exact scroll position (not item index) for the listbox to scroll to, and have it scroll smoothly to that position (through my own scrolling routine). Is there any easy way to accomplish this. I'm attempting to accomplish a percentage based auto-scroll routine. So I can move 25% down the list or 50%... etc.

Edit: Nevermind, I simply looked up the javascript for the scrollIntoView method and used that as a jumping off point.