aim helper for pool

hy,

I am trying to make a aim helper for a pool game, something like this:

http://www.all-freeware.com/images/full/109277-poolians_free_pool_2d_games___entertainment_sports.jpeg

what is the best method to do this? launching an invisible ball?

thks,
Edou [import]uid: 92107 topic_id: 20920 reply_id: 320920[/import]