ram upgrades

Hi guys, I'm looking to replace a few bits in my iMac. Just to verify - what airport card, hard drive and ram do I need for my iMac G5?? Charlie

I know that I have two DIMM slots in my G3 400mhz. The machine shipped with 128MB of ram. and I'm eager to improve my OS X functioning with some memory upgrades. I want to max it out at 512MB. here's the question. Is this 128MB part of the machine or does this take up a DIMM slot? In other...