[FreeJ] New in here and some methods I can't use

Hello,

I'm new in here, and in freej, but I already find it really a cool soft!

I'm writing my first script (js), and, though I'm quite used to oop, I cannot
get some methods working (actually, it looks like they do not exist).
It's the following ones:
MovieLayer

    * forward()
    * rewind()
    * mark_in()
    * mark_out() // starts looping between mark_in and mark_out
    * pause()

listed on that page:
http://lab.dyne.org/FreejScripting

Browsing the sources, I've seen that mark_in and mark_out were members of
MovieLayer class, but I couldn't find any of the other.
I couldn't get mark_in and mark_out working, though.
Then, I found a key-bindings file, with j/k i o p and l as bindings for those
methods, but it didn't work either. Freej tells me that these methods aren't
methods.
Any help would be greatly appreciated.

By the way, what I basically need is to seek into the file (what would be
excellent would be a mean to go straight forward to a timecoded frame -
something like switchtoframe(frameposition) ), and also this looping thing.

Thanks a lot.
Aurélien