[TYPO3] Linking top menu display and selection with Left menu display

[Abhishek]

Hi All,
I am working on Top navigation implementation. For the
following site structure -
	A
		A10
			A100
			A110
		A20
			A200
			A210 
	B
		B10
			B100
			B110
		B20
			B200
			B210 
	C
		C10
			C100
			C110
		C20
			C200
			C210 

	
Following is the summary of what I need to do and what
I have done : 
  Req 1 >  Display Top-navigation bar. This must show
only : A, B, C 
  
  Req 2 > When user rolls over the mouse over any of
tob navigation menu items, say A, 
  	drop-down should only show A10 and A20.(strictly 1
level of menu)
  
  Req 3 > When user clicks on A, left navigation
should display A10 and A20. 
  	Upon clicking A10 or A20, corresponding submenu
should unfold. [(A100, A110) or (A200, A210)]
  	
  Req 4 > Display the left most item on Top navigation
active. A will be active in top navigation, 
     	and childs of A - A10 and A20 will be displayed
in left navigation. by default, A100 will be active
link.
  
I have accomplished Req 1 and Req 3. 

Issue I am facing with Req 2 is - I can't link the
menu clicked at Top navigation with display of
Sub-menu.
Also, thoughts/ideas on implementation of Req 4 will
be  helpful.
I desparately need a solution on this, sooner the
better. Any pointers will be helpful.

I appreciate the time and effort from all community
members on this and will be grateful for all your
help.

Thanks,
Abhishek