Image Scrolling?

Okay, this is going to be a bit hard to explain I think, but here goes.

This is a mockup of my next site. I want the picture to fit inside the white lines, but have a scroll bar so you can move it back and forth to view the whole thing. I also want to be able to edit the way the scroll bar looks. How can I accomplish this?

p.s. sorry about sounding stupid, but it is 4am.