Using dhclient to update zoneedit with my dynamic IP address

[JJB]

The zonedeit FAQ says this command can be used in dhclient to
update my dynamic ip address at zoneedit when ever dhclient
gets an new IP lease from my ISP.

wget -O - --http-user=username --http-passwd=password
'http://dynamic.zoneedit.com/auth/dynamic.html?host=www.mydomain.com'

Anybody doing this, or know what to add to /etc/dhclient.conf to make this
happen