Treeview(asp.net 2.0) with check boxes

[pushpi]

Hi,
i'm using the Treeview contol in asp.net 2.0 (present in VS2005
toolbox).
i'm having checkboxes for all the nodes in the treeview.All i want to
have is that
On Checking a checkbox for a parent node ,the checkboxes for all the
child nodes
must get checked---this functionality should be implemented on the
client side,using javascript.
can i postback the page every time i check a chechbox?

thanks
pushpendra