Scrolling Art Gallery Wall

Hey guys,
First check this page out,

My main wall is the movieClip, mcWall, so when I move my cursor to the right my mcWall moves to the left. When I reach the edge, right or left most, my movie clip should stop there. It should be like a wall is moving according to the cursor. I think I am going wrong somewhere with my code.
I also want easing.

Please help me out, I have a deadline with my client.