How to make a multi level(cascaded) menu navigation

I am trying to make a cascaded menu navigation control for which I have copied the following code but it is a simple menu navigation

http://javascript-array.com/scripts/simple_drop_down_menu/#

i need a cascaded one ...Plz help me out!!
 
means

Item A--->itemA1
                itemA2--->itemA2.1
                                  itemA2.2
                itemA3

smwhat like this