how may i deny many streams downloads using ipfw

[stepan]

 Hi all!
 Please tell me, how to set disable of many streams download
 (using Flashget or Reget) via my FreeBSD-4.7.1 router using firewall.
 My `pipe' settings are ineffective where whit this programs.

 Best regards
 
 stepan
                           mailto:sbakalyas at yandex.ru