Hi,
That laptop takes DDR2-533 MHz RAM. You should istall the DIMMs in pairs for best performance. Take a look at these RAM pairs:
http://www.newegg.com/Product/Produc...82E16820231117
http://www.newegg.com/Product/Produc...82E16820146516
Both are good quality.
Take a look at this guide for laptop RAM selection.
http://www.techsupportforum.com/827494-post5.html