You can check with the command "rpm -q dhcpcd" to see if you have the dhcp client installed.
Also, run through the "yast2" setup again. It should have installed the dhcp client for you and opened a port for it in the firewall. Be sure you select "dhcp". The dialogs changed with SuSE10.3. It may in one of the advanced selections on the bottom of the dialog.
You could also manually edit the /etc/sysconfig/dhcp file changing a line:
## Type: yesno
## Default: yes
# Should the DHCP client modify /etc/resolv.conf at all?
# If not, set this to "no". (The default is "yes")
# resolv.conf will also stay untouched when MODIFY_RESOLV_CONF_DYNAMICALLY
# in /etc/sysconfig/network/config is set to "no".
DHCP needs to be selected for the interface as well:
However doing these through YaST would be easier. YaST will edit them for you. You do have the hardest part accomplished. Your wireless device works!