Animated buttons question (flash8)

I will try my best to explain what i need to do,

2 vertical bars placed right beside each other, when mouse rolls over the left one it expands to the right (only the width changes the height is the same) becoming a rectangle, while it expands it pushes the bar on its right to the right. When it finishes expanding it reveals an image. Mouse rolls over the right bar it expands to its left (same animation just the opposite direction) while its pushing the rectangle on its left to its original position and shape (vertical bar) and when it stops after the full length of the rectangle is revealed it reveals an image.

I hope its understandable, i actually need to have way more than 2 bars but its easier to explain this way…:-/

I have Absolutely No Clue on how to do this, please HELP!:jail: