there is several site devoted to installing mac osx on a p.c how ever there is not a iso image that will allow you to install the os like windows some sites post mother boards that will work directly how ever you still have to get the mac os
You basically use a boot cd, then install OSX from a legit DVD, It will only work with certain motherboards however.
Have a look on InsanelyMac for a guide on installing with your motherboard or laptop, no one guide will work for every PC, and its likely you will have to install kexts after the main installation has finished.