Thanks man, it works! I didn't know it's so easy. So you must be root to change owneship to erybody.
Ok, my next question is, how can I set a directory accessible only by me (as a user)? Because now, everybody has acces to it with "chmod 0777". So for security reason, I want only me (as a user) to gain acces to "/opt/lamp/htdocs" the rest of lamp I'll keep it root level.
I'm sorry for my stupid-look-a-like questions, but as a former windose user it's not a surprise to ask these questions.
Thank you very much.
There is more than a physical universe. Tell a worm the world is so beautiful, he won't believe you because he has never seen the world.