xubuntu - How do I start x11vnc via bash script on startup, not login?

I have a server with Xubuntu 11.10 Desktop installed, and x11vnc. When on login screen I want x11vnc to start and to take some settings:

Automatically set defined password

Automatically accept conncetions, but ask for a password

Automatically start this script on loading the system, not the user profile.

How can I do this.