How to implement fast forward for vlc-mozilla-plugin?

[et_me]

Hi, i'm trying to implement fast forward, rewind buttons for the
vlc-mozilla-plugin... i suppose i have to set some variable using the
set_str_variable javascript function but i can't find wich variable
name to use. Is there a list of variable names i can use with the
functions set_int_variable, set_str_variable, set_bool_variable?

I been googling but failed. Any help is appreciated. Thankz in advance