I have a problem with the wifi... its able to connect to my router but I'm not able to use the internet, my Covoco website wont load, ebuddy wont connect, fring wont connect, android market wont load. the wifi internet was working before and now its not.

currently my laptop is connected via wifi and its confirmed I can browse websites and chat through aim. 3G network works fine but I want to save battery life when I'm at home.

what seems to be the problem?

Any help will be appreciated.
Thank you.