Help needed: Kext files for hp g61 320ca

[connormc0]

Hello I am currently using an HP laptop model HP G61 320CA & I need a bit of help selecting the .kext files needed to have leopard run smoothly. I am currently running IPC & have updated successfully from 10.5.6 to 10.5.8. I have a lot of my hardware already working but need to find the appropriate .kext files for my audio, wifi and graphics card

These are the specs of my laptop found on the HP site:

GRAPHICS

Graphic Subsystem Name: ATI Radeon™ HD 4200 Graphics

Video RAM With 128MB Display Cache Memory AMD M880G with 128B GDDR2 (sideport memory)

AUDIO

Internal audio: Altec Lansing

WIFI
Network interface Integrated: 10/100BASE-T Ethernet LAN (RJ-45 connector)
Wireless Technologies: 802.11b/g WLAN
Wireless capability: Yes

Any help you could provide me with would be greatly appreciated as I have spent about 2 weeks trying to get this going with no luck