Browsers take a long time to resolve ip address

I just recently installed Suse 9.1 on an older pc. I have most everything working now but I have a problem when the browsers (Mozilla 1.7 & Konquarer) try to convert an address to the ip address. It acts like something has to time out and then it goes ok until it has to resolve another address. I set up the gateway and it does eventually get the ip address. Does anyone have any idea where to start looking? Bob Rawlinson