ActionScript 3.0 :: Endless Tween In From Screen Right And/or Left

Imagine you have 10 movie clips, only 1 is visible on stage at any time. Using the arrow keys for example, you can move through the movie clips, click left and the one on screens moves left and the next one in line moves in from the right. When you reach number 10, and you click left, number 10 will move off left and number 1 will come back on right. And vice versa.

This is what I have to try to get worked out. Currently I have a variable which keeps track of which panel is displaying, and as I click on one of two movie clips I check with a conditional to see if that variable is >10 or <1 and then either + or - 1 appropriately, or set it to either 1 or 10, so that number loops.

So that logic part works. What I now need to do is cleanly work out the tweening of the movie clips. I'm using TweenMax. I am currently using another conditional that gets told if the user pressed left or right, then it uses a switch to check the current panel number, and then after all of that it tweens the correct stuff. But that's a huge load of code and I reckon there must be a cleaner way.

Here is my messy code:

Code:
package
{
import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.events.Event;

[Code].....