Configuring Brother HL-5370DW under Linux

Trying to configure a Brother HL-5370DW wireless printer
under Slackware 12.2 to talk to a Linksys WRT54G2 that's
using WPA-PSK(TKIP) encryption.
The 5370DW literature all says it supports TKIP, but
when I point a browser to the printer (using its wired
ethernet) and then click on its Network Configuration --
Configure Wireless page, it only offers Encryption Mode
choices None or WEP.
I tried browsing through all its pages, without coming
across anything that seemed useful for this. And couldn't
google a solution either. Anyone know how to configure
this printer (preferably via its web interface)?
Thanks a lot,
--
John Forkosh ( mailto: where j=john and f=forkosh )