Three Card Monte

I’m trying to figure out how to make a Three Card Monte game… Here’s my code.

package {
	//Imports
	import flash.display.MovieClip;
	import fl.transitions.Tween;
	import fl.transitions.easing.*;
	import fl.transitions.TweenEvent;
	import flash.events.MouseEvent;
	import flash.utils.Timer;
	import flash.events.TimerEvent;
	import flash.events.Event;
	
	public class poise_3cardmonte extends MovieClip {
		static const num_cards:uint = 3;
		
		
		
		
		
		
		var falseCup_1:emptyCup;
		var falseCup_2:emptyCup;
		var trueCup:correctCup;
		
		var Option:Number = 0;
		
		var currentTimer:Number = 5
		var startTimer:Timer = new Timer(1500, 5);
		
		var positionSpot:Array = new Array(position_1, position_2, position_3);
		
		var position_1:Number;
		var position_2:Number;
		var position_3:Number;
		
		var p1_Taken:Boolean = false;
		var p2_Taken:Boolean = false;
		var p3_Taken:Boolean = false;
		
		var temp1:Number = 0;
		var temp2:Number = 0;
		
		public function start3CardMonte() {
			trace("Game Hast Begun!");
			
			
			
			//Cup Callout
			falseCup_1 = new emptyCup();
			falseCup_2 = new emptyCup();
			trueCup = new correctCup();
			//Positioning
			position_1 = pos_1.x
			position_2 = pos_2.x
			position_3 = pos_3.x
			
			addChild(falseCup_1);
			addChild(falseCup_2);
			addChild(trueCup);
			
			falseCup_1.y = pos_1.y;
			falseCup_2.y = pos_1.y;
			trueCup.y = pos_1.y;
			
			placeCards();
			startTimer.addEventListener(TimerEvent.TIMER, ReadyGo);
			startTimer.addEventListener(TimerEvent.TIMER_COMPLETE, StopTimer);
			startTimer.start();
			
			
		}
		public function placeCards()  {
			if (Math.random() < .3){
				trueCup.x = position_1;
				falseCup_1.x = position_2;
				falseCup_2.x = position_3;
			}
			else if (Math.random() >= .3 && Math.random() < .6){
				trueCup.x = position_3;
				falseCup_1.x = position_1;
				falseCup_2.x = position_2;
			}
			else {
				trueCup.x = position_2;
				falseCup_1.x = position_3;
				falseCup_2.x = position_1;
			}
		}
		public function ReadyGo(e:TimerEvent){
			trace("Swapped");
			makeSwappage();
		}
		public function makeSwappage() {
			//Swap Cards
			Option = Math.ceil(Math.random()*3);
			
			switch (Option){
				case 0:
				trace("Swap #0");
				break;
				
				case 1:
				trace("Swap #1");
				break;
				
				case 2:
				trace("Swap #2");
				break;
				
				case 3:
				trace("Swap #3");
				break;
			}

		}
		public function StopTimer(e:TimerEvent){
			startTimer.stop();
			trace("Timer Stopped");
		}
		
		
		
		//SWAPS
		public function Swap_1(e:Event){
			temp1 = trueCup.x;
			temp2 = falseCup_1.x;
			
			//LOST HERE
			
		}
		
	}
	
}

How would I cause them to swap?
I could take the long route and do it MovieClip wise… but that would be inefficient.