I wish to install Leopard (or Snow Leopard) on my computer but I have a little trouble to find which installation method will probably work on my PC.

My PC is:
Fujitsu Siemens laptop
Model: Amilo Pa 1510
CPU: Mobile AMD sempron 3200+ (797MHz)
Memory: DDR2 512MB
GPU: ATI Radeon Xpress 1100 (Memory: 64MB)
Current OS: Windows XP Home Edition (ver2002 SP3)
(Another info. that i belive may be of importance: MMX(+), 3DNow!(+), SSE(1,2,3), x86-64)

I wish to install the Leopard as Dual Boot (and keeping my current OS as is) or as I prefer on disk-on-key (8GB).