Whenever I try to change the recharge rate for either the shields or laser by pressing the F9 or F10 keys on my laptop it will not work. My laptop has them set to either decrease or increase sound volume respectively. Is there anyway I can work around this or clear the function that is pre-set for the those function keys?

post nr 3

http://www.gog.com/forum/star_wars_tie_fighter_special_edition/how_do_i_change_keyboard_config_to_turn_off_f9_so_i_can_recharge_laser_cannons