Wlan0--cannot reach internet

I am first starting with Linux and Suse 9.0. After much fiddling I mangaged to properly configure wlan0 on my Dell Latitude C400 to allow me to ping my router, a Linksys BEFW1154 wireless router, and to access the configuration program on the router. However, I cannot reach the internet. For example, trying to reach www.google.com returns the error "Unknown host www.google.com". (I can reach the internet using the ethernet port on the Dell.) What I am doing wrong? jdj