sliding in/sliding out images using Actionscript

[da_root]

I know I should probably know how to do this by know but I'm stuck.
How do I create this effect using Actionscript?

http://synap-sys.com/in_out_slide.html

When a user clicks on button "1" the image slides in from the left. When the user chooses to view image "2" image one slides out of the way and image two then slides in. I would like to do this using Actionscript because there's going to be a bunch of pictures that are part of this slideshow. It's how to tell the Flash player how to slide out the current image and slide in the new image that I'm struggling with. Forgive my lameness.
I'm also trying to do this without dynamically loading each image everytime they click on a button. The reason for this is so all the images load at once, thereby eliminating the delay that would occur as each image loads after a user clicks a button. A fellow Flashkit member(Garbage) suggested I do this using a Library clip (all the images placed on a keyframe of a movieClip that are referenced per button click) but I'm not sure how to do this (goToAndPlay?).
Any help or guidance would be most appreciated.
I've attached the .fla if anybody wants to look at it.
Thanks
Adam