Imac G3 internet

You ned an Internet Service provider. Ultimately you end up with an ethernet connector you plug into your Mac.

If you want wireless I suspect it would have to be USB because those iMacs are difficult to add PCI cards. The other issue would be if you can find one to work with 10.3.9. Your USB ports are likely also very slow version 1.1

Which specific model iMac G3 do you have? It may have an AirPort card pre-installed.

You need this AirPort adapter card: http://www.amazon.com/Apple-M8753G-AirPort-Carrier-Adapter/dp/B00006I51H

and an original AirPort Card (802.11b): http://www.amazon.com/gp/product/B0000899ZD/

If it is already installed it will be found in  > About this Mac > More Info...

but your AirPort icon would be present as well:

Note the internal AirPort card can only be installed on slot loading G3 iMacs. Those would be the 400 MHz and faster ones. You're out of luck with earlier models: http://support.apple.com/kb/HT2256

iMac G3 is to slow for the internet.

NO, NO, NO internet on a g3 iMac.... your iMac will browse the Internet very very slowly

my tipp:

use the opera internet browser, opera will run slowly, but not so slowly like the safari browser, and it will support new webpages

Edit: but all programms run slowly on PowerPC G3 Based Machines, especially the iMac G3

iMac G3 is to slow for the internet.

iMac G3 will load Internet pages exactly as fast as it did the day it was built. The problem is that Internet pages have become woefully clogged with gratuitous junk since then. Flash in particular will grind it to a halt.

Turn off Java and use ClickToFlash - same as I do with a brand new iMac.

Depending on which G3, it will be slow to very slow but useable.