Hi, I successfully installed MACOSX in my PC using PearPC emulator and got internet connection too.
First I tried to use PearPC control panel to generate ppc.cfg file but I couldn't boot and got many troubles.
Then I decided to make my ppc.cfg file and is like this:

ppc_start_resolution = "800x600x15"
redraw_interval_msec = 40
prom_bootmethod = "select"
prom_env_machargs = "-v"
prom_driver_graphic = "video.x"
memory_size=0x10000000
pci_ide0_master_installed = 1
pci_ide0_master_image = "macosx_3gb.img"
pci_ide0_master_type = "hd"
pci_ide0_slave_installed = 1
pci_ide0_slave_image = "OSXInstaller.iso"
pci_ide0_slave_type = "cdrom"
pci_3c90x_installed = 1
pci_3c90x_mac = "de:ad:ca:fe:12:35"
pci_rtl8139_installed = 0
pci_rtl8139_mac = "de:ad:ca:fe:12:35"
pci_usb_installed = 1
nvram_file = "nvram"

I set up memory size 0x10000000 i.e. 256 MB and set pci_3c90x_installed = 1 to use 3comc90x network card, and downloaded driver from
http://pearpc.sourceforge.net/apsl.html.

Got internet connection sucessfully!!