Wireless isnt working properly - alu macbook

[Bengaboy]

I have an aluminum macbook and the wireless keeps cutting off.

Basically, the airport thing at the top says it is connected, but to actually load up web pages - it needs to be turned off then turned back on again for it to work. Its done it loads of times today...

Anyone have a guess at what the problem might be?

 

[Bengaboy]

Im using a Netgear DG834N modem router, using a WPA encryption and have installed all the updates it tells me to. (dont know if the airport updates are seperate?)