I have trouble conecting wireless

I just installed ubuntu 8.04 on my laptop Presario V2000 Ive managed to install the modem, LAN and wireless drivers but I just cant get it to connect trough wireless and wenn it does it just doesnt open any web pages even though it shows to have a 100% connection (being next to the wireless router)...

I am able to connect via LAN and havent tested connecting via modem so if you could help me fix this thing (Wireless connection) Id be gratefull.