Hi hikaru and thank you for your reply. After reading the post you showed me, I searched for the amilo pa1510 on the web and I found this article
http://tekonsblog.blogspot.com/2009/04/amilo-pa-1510-memory-upgrade-howto.html but I think my laptop is a bit different because it has a plastic part,containing the power switch..the webcam one..ecc, above the keyboard that I think should be remomed to reach the keyboard.You can see this plastic cover in the image at this link
http://www.notebookcheck.com/typo3temp/pics/cb30247200.jpg. You will notice, near the Esc key and the End key, the line where this plastic cover ends . When I remove the 5 flat screws present in the battery slot, I feel this cover more free to move but..I can lift it but I can't remove it at all..there's still something blocking it.. maybe a plastic clip but I'm afraid of breaking it.Do you have other suggestions hikaru?Thanks a lot!!