Array and swap function - actionscript-3

Question

Here is a simple drag and drop "game". I have 4 dragged movieClips (paris, london etc) and 4 dropped movieClips where you need to put dragged object (paris_match, london_match etc).
1) So, how to create correct Array with dropped movieClips?
2) How to swap dragged objects between themselves when they are on dropped places?
Big thanks.
package {
import flash.display.MovieClip;
import flash.events.*;
import flash.geom.Point;
public class Travelling extends MovieClip
{
protected var originalPosition:Point;
protected var hitArray:Array; // EDIT
public function Travelling()
{
originalPosition = new Point(x, y);
hitArray = new Array("paris_match" , "berlin_match" , "rome_match" , "london_match"); // Edit
buttonMode = true;
addEventListener(MouseEvent.MOUSE_DOWN, down);
}
protected function down(e:MouseEvent):void
{
parent.addChild(this);
startDrag();
addEventListener(MouseEvent.MOUSE_UP, stageUp);
}
protected function stageUp(e:Event):void
{
stage.removeEventListener(MouseEvent.MOUSE_UP, stageUp);
stopDrag();
if(dropTarget) {
for (var i = 0; i < hitArray.length; i++) { // Edit
// !!!!!------This Array works not correctly-----!!!!!
if (dropTarget.parent.name == hitArray[i]) { // Edit
x = dropTarget.parent.x;
y = dropTarget.parent.y;
} else {
returnToOriginalPosition();
}
} // EDIT
} else {
returnToOriginalPosition();
}
}
protected function returnToOriginalPosition():void
{
x = originalPosition.x;
y = originalPosition.y;
}
}
}