Flash cs3 help

does anyone know how this is done?
specifically, the way they are opening and closing information and adjusting the scrolling so that the new information is at the top of the screen while appearing to never leave the original frame. For instance, is the information that is opened when you click on the headings being loaded externally into an empty movie clip?
Any suggestions would be appreciated. I am kind of new to flash and action script but would like to recreate something similar to this.

Thank you