how to initially open the accordion menu on a "NESTED LEVEL " / 2nd level

Question

Hi searched the forum couldn't find the answer, 

How do I initially open a nested level / 2nd level. i figure out to initially open first level but not the sublevel after that.

played with the parameters but couldn't make it work?

 

var parentAccordion=new TINY.accordion.slider("parentAccordion");

parentAccordion.init("acc","h3",-1, 0 , "acc-selected");

 

 

i figured my own answer.. should be on the fourth parameters on the initialize code

thanks