iPhone and home wifi network

Hi all,
I have recently purchased the 3G iPhone and all is well apart from my iPhone will not use my home wifi connection. It continues to use the 3G even while I am at home, feet from the router! it is a secure Network which I have the password and key for. When I forget the network and then re-join it I need to enter the password, and the iPhone claims to be connected to the Wifi network but still uses 3G for all safari browsing and mail. I am using AOL and a Netgear router. I would claim only to be proficient with PC's and I am looking for advice as the iPhone has no problems using wifi when out in public places (Starbucks etc). Do I need to manually put IP addresses, DNS, Router details etc?
Suggestions please. thanks

try setting the proxy off or auto, also disconnect the power from the router and reconnect.

here are some setting :

Automatic:

Active Location: Yes
Services:
AirPort:
Type: IEEE80211
BSD Device Name: en1
Hardware (MAC) Address: 00:2f:62:c1:a4:2f (fictional)
IPv4:
Configuration Method: DHCP
IPv6:
Configuration Method: Automatic
AppleTalk:
Configuration Method: Node
Proxies:
Proxy Configuration Method: 2
ExcludeSimpleHostnames: 0
FTP Passive Mode: 1
Auto Discovery Enabled: 0
IEEE80211:
AllowNetCreation: 1
JoinMode: Automatic
MAC Address: 00:2b:33:c4:b2:7b
Built-in Ethernet:
Type: Ethernet
BSD Device Name: en0
Hardware (MAC) Address: 00:1b:63:44:db:a1
IPv4:
Configuration Method: DHCP
IPv6:
Configuration Method: Automatic
AppleTalk:
Configuration Method: Node
Proxies:
FTP Proxy Enabled: 0
FTP Passive Mode: 1
Gopher Proxy Enabled: 0
HTTP Proxy Enabled: 0
HTTPS Proxy Enabled: 0
RTSP Proxy Enabled: 0
SOCKS Proxy Enabled: 0

AirPort:

Type: AirPort
Hardware: AirPort
BSD Device Name: en1
IPv4:
Configuration Method: DHCP
IPv6:
Configuration Method: Automatic
AppleTalk:
Configuration Method: Node
Proxies:
Proxy Configuration Method: Manual
ExcludeSimpleHostnames: 0
FTP Passive Mode: Yes
Auto Discovery Enabled: No
Ethernet:
MAC Address: 00:1b:63:c4:a2:2b
Media Options:
Media Subtype: autoselect

Built-in Ethernet:

Type: Ethernet
Hardware: Ethernet
BSD Device Name: en0
IPv4 Addresses: 192.168.2.25
IPv4:
Addresses: 192.168.2.25
Configuration Method: DHCP
Interface Name: en0
Router: 192.168.2.1
Subnet Masks: 255.255.255.0
IPv6:
Configuration Method: Automatic
DNS:
Server Addresses: 192.168.2.1
DHCP Server Responses:
Domain Name: 0x00
Domain Name Servers: 192.168.2.1
Lease Duration (seconds): 0
DHCP Message Type: 0x05
Option Overload: 0x03
Routers: 192.168.2.1
Server Identifier: 192.168.2.1
Subnet Mask: 255.255.255.0
Proxies:
FTP Proxy Enabled: No
FTP Passive Mode: Yes
Gopher Proxy Enabled: No
HTTP Proxy Enabled: No
HTTPS Proxy Enabled: No
RTSP Proxy Enabled: No
SOCKS Proxy Enabled: No
Ethernet:
MAC Address: 00:1b:63:94:fb:a1
Media Options: Full Duplex, flow-control
Media Subtype: 100baseTX