Your system may not be upgradable at all. Might be time to consider a new laptop.
I think your laptop has a max memory of 2 gb and a maximum of 1GB per slot. That is what the website said at www.crucial.com says about your system.
This is probably what it has in it or something similar.
Crucial RAM
Part Number: CT534774
Module Size: 1GB
Package: 200-pin SODIMM
Feature: DDR PC2700
Specs: DDR PC2700 • CL=2.5 • Unbuffered • NON-ECC • DDR333 • 2.5V • 128Meg x 64 •