ipfw, ftp and wget

[vittorio]

I'm using ipfw as firewall. 
What rules should I add to use both wget and ftp from my box only towards the 
internet through my iwi0?

(I found the following lines for ftp but they don't seem to work:
..............................................................
ipfw add 45 allow tcp from any to any 21 in setup keep-state
ipfw add 46 allow udp from any to any 21 in setup keep-state)

Vittorio