Wireless Connected but Cannot Browse

My PC (with XP OS) is connected to a Cable Modem and Im using a LinkSys WRT54G to share on my LAN.I tried to connect my Laptop to the router wired on and its connected fine.However wireless connection is connected but unable to browse IE or Firefox. What is the problem here? There is DHCP and Static DNS on the router setting.What do I need to change on my router setting in order for my laptop to connect to Wireless Internet

Thanks !