AirPort and G3 imac

I recently just bought a G3 imac [333mhz, tray-loading] and I was really wondering if I was able to use an AirPort card with it [Not AirPort Extreme, and it said when I bought it that the computer was already Airport ready] because I've been reading in places that Tray-loading G3's don't "do" AirPort Cards.
And if anybody could possibly tell me how to do about putting it in, if I'm actually able to do it.
Thanks!