camera movement

My game resolution is 640x480.
My scene resolution is 1080x720.
When my actor moves, I want that a camera also moves with the actor in the center of this camera. In other words, the center of the camera is anchored to the actor and when actor moves, camera moves together with the actor.

How can it be done? Please give me a piece of advice.

Theres a tutorial right here: http://www.stencyl.com/help/view/backgrounds-and-foregrounds/
And a member here created this: http://almakos.weebly.com/1/post/2012/09/parallax-scrolling-in-stencyl-using-actors.html

Mikuri, thank you very much!!!