[support] Menu navigation block

[Fernando Silva]

Hi,

Assuming I have a menu "Primary Links" with the following items:
-- Page 1
---- Page 1.1
---- Page 1.2
-- Page 2
---- Page 2.1
---- Page 2.2

It is easy to put the "Page 1" and "Page 2" at top of the page. But
now, when I click in "Page 1" I want to have a left column block,
showing only the child menus.

This is similar to what the book module does, but instead of using a
"book structure" it should use the "menu structure".

Anything done to accomplish this?

Regards,
  Fernando Silva