mr. magoo, the best thing you can do is go to www.memoryx.com and click the "Check your computer" button. Let us know the specific memory it recommends and then we can make a better suggestion for you. Thanks.
u have to find out what ur motherboard supports. the link you sent specified pc3200 ram.
I would suggest getting a 1 GB stick at a minimum and taking the one you currently have out of the computer. its likely the one you have in there now would only slow the other, newer stick of ram down. the reason being that ram defaults to the slower value when sticks are used simultaneously.