Hello everyone i have an iphone 3G

I turned the 3G off so i can use my Wifi at home.

I cannot connect to the internet even though my iphone is connected to my network.

i get the error in safari "Safari cannot open the page because it is not connected to the internet"

my wifi works properly as my wireless computers all connect and work fine.

I called my ISP they said call Dlink, i called Dlink and they said they can't figure it out.

Help!