How to get the number of displayed line the point is in?

[Marcin Borkowski]

Hi all,

as in the subject.  I want to know how far the point is from the top of
the screen.  (What I actually need to do is to inert something in the
current buffer in such a position so that it appears precisely on the
last visible line.)

TIA,

-- 
Marcin Borkowski
http://mbork.pl