Replicating Cover Flow look?

Here's a doozy. Let's say I have X number of layers (ie: 10 images). How could I
construct an expression to flip through them in a Cover Flow type manner?

I'm thinking a slider control (0-100) would drive the animation. At 0 all the
layers would be stacked on the right. At 100 all would be stacked on the left.

Here's my logic, but unable to put it into expression-ese:

CompWidth= the value for the width of the comp.
CompHeight= duh
Completion% = Slider value
Put the Layer at position (0, (.5*CompWidth))
Rotate Y -60°
Move layer Completion% of compWidth (maximum value= compwidth)
If X position value is 1/2 compWidth, rotate Y 0°
(To prevent it from suddenly flipping to 0° at the midpoint, I think it should
be: if X position is (1/2 compwidth - 200) interpolate between -60° and 0°. If X
position is (1/2 compwidth + 200), interpolate between 0° and +60°.)

In other words, if the layer is approaching the center and is within 35% of the
midpoint, it should start to rotate the Y value to 0°. If the layer is leaving
the midpoint and is more than 35% away from the midpoint, start rotating Y to
+60°.

I had a go at this, but by using simpler expressions with some keyframed
animation. Here's a link to the project:

There's a member of fxphd.com that has created a very elaborate project where
every parameter is controlled dynamically. You have to pay to join, but it's
definately worth it:

 <http://generalspecialist.com/2007/10/best-vfx-graphics-and-animation.asp>
;

- Jonas Hummelstrand