I would like to run Windows7 and Mac OSX on my computer.
I intend to run Mac OSX from an external hard disk.
What is needed with the following specs:

HP Pavilion dv5 Notebook:
CPU: AMD Turion X2 Dual-Core Mobile RM-74
Motherboard: Quanta 3600
RAM: 1x2GB DDR2 800 Rev 12
GPU: ATI Mobility Radeon HD 3400 Series
Optical Drive: Optiarc AD-7561S ATA Device
Network Adapter0: AR5007 082.11b/g Athereos
Network Adapter1: RLT8168C(P)/8111(P) PCI-E Gigabit Ethernet NIC (NDIS 6.0)

Thanks for any help that can be provided!