it would be cheaper to upgrade the ram.
heres your ram specs pulled from cnet
Memory
RAM 512 MB ( 2 x 256 MB )
Max RAM Supported 2 GB
Technology DDR2 SDRAM
Speed 400 MHz / PC2-3200
shop for "PC2-3200 DDR2 SDRAM" and make sure to get a two stick configuration...for exmaple with a 4gb upgrade get a 2gb and a 2gb stick to occupy both slots. also be aware of 3.5gb ram limiration on the 32 bit os