iPhone and home wifi network

[Beneficence]

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

[Navman]

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

[Raiz]

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