Yes u can install OS X LEOPARD on your laptop but u can't do it easily since OS X is for macs and for using them on a Windows powered PC,u have to use some hacks to install it.
It's not recommended to install OS X on a windows powered PC because even if u do it,it won't perform as well as it does on Macs also there will be some driver issues too
If you want to run a Mac OS, why don't you just buy a Mac?
Oh, wait, I guess it is because they are hugely overpriced, highly overrated, and there are 10 times more programs and apps made for PC's than there are Macs. Sorry, what was your question? Something about running a Mac OS on a PC, why would you want to do that? So all those programs written for your PC won't work any more?