Phillip,
Adding memory is very easy, refer to your owners manual.
(If you don't have it, see page 133:
http://h200005.www2.hp.com/bc/docs/s.../c00091009.pdf )
That laptop comes with 256 Mb, so it probably has 2 256 Mb Ram modules... To upgrade to 1 Gb Ram, you will have to replace both of them with 512 Mb Ram modules.
I did a quick search on part no. 238879-001 and found 1 auction on ebay ($224 ea.)
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WD1V
Kingston.com has their equivalent module for $172 ea. :
http://www.ec.kingston.com/ecom/conf...submit1=Search
Kingston gives you 5 choices for online vendors, the one with the cheapest freight will get 2 of these to you for a total of $342.38.
Just saw your location is China... The freight above is for US only...
Hope this helps.