Grabing/moving images?

In Flash, lets say I am displaying close-up views of designs and other artwork inside a viewing area. I need to know how to pan around an image that lies within that viewing area by clicking/holding on the image (which grabs it) and pulling it around the viewing area. This (good) website uses what I’m talking about (when the projects are displayed):

www.donhavey.com

Could someone provide some insight into how this is done?
Thanks!