First of all, when you wanna get parts get them from an auction site! Ebay is the best since its worldwide and cheap. You can either buy used working parts or brand new. I would buy brand new but its fine to buy used.
Acording to the manual http://uk.ts.fujitsu.com/rl/servicesupp ... ly_aug.pdf
it has DDR2 memory and not DDR.
But it doesnt say the max supported memory but i would think it is either 2GB or 1GB.
I would buy two 1GB and fit both and see if it works and if it doesnt just take one away. They are very cheap so u dont lose any big money. (If u buy on Ebay)
This is one version http://viewitem.eim.ebay.se/Corsair-1GB ... 95109/item
(Just an example, havnt got time to find one with 2x 1GB.)
But just search on DDR2 SDRAM 533 and u will find something that fits u.
Its easy if u just take out the RAM u got and find a same on ebay but with more memory.