You can try using the scrollTo() method:
The next question may be: what values do I pass to scrollTo() (like where's the bottom going to be necessarily?)
I'm not too sure how it would work, but my guess might be to find out how big the body area is, and then scroll to that Y-value. Just my guess, I've never tried it..
Mess around with it and see if you can get it to go. Perhaps in the meanwhile someone with the knowledge can advise you better.