I don't use emulation, so I can't really help you out. But, a quick Google search led me to a page that you may find useful.
Also, all emulators work differently. So if you want help regarding a certain one, you have got to be specific. Merely saying a "PlayStation 2 emulator" does not help, for there are at least three different ones out there.
According to this site, this "PCSX2" is the best PS2 one. But again, I wouldn't know. I hardly ever use emulation at all.
_________________ The Local Video Gaming Lunatic
Recent stuff I'm into:
Watching: A Certain Scientific Railgun (ep.14, stalled), Hoshi no Kirby (ep. 71, stalled), Nazo No Kanojo X (ep. 8), Acchi Kocchi (ep. 8)
Reading: nothing