dhclient

Hi,
    I have set a wireless card up on Redhat 9.0. It works well but every
time I log in, I need to use "dhclient eth0" to activate the card, or
there is no connection.  Can I  write some script so that I do not have to
do this? (Card model:  Belkin F5D 6050)
    Another problem: I often get disconnected in a few minutes when I ssh
to some remote machine. What might cause the problem?
    Thanks a lot. I use cygwin more than linux, but still hope to fix
these problems.