Drag and Drop with a response in Flash..please help

Hi

I have just started with flash and actionscript3 about 5 weeks ago. I'm in my first year uni and I have a drag and drop assignment (for a kindergarten class). Its "little Red Hen" and they have place the correct picture in right holder.

I have gotten the drag and drop working but I can't seem to figure out how to display a tick when they have place it in the correct holder.

Please help....

This is my script (it may seem messy...still new)

import flash.events.MouseEvent;

/*Mouse Event that ensures the function of hen movieclip to start dragging
  when mouse is pressed*/

hen1_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);
hen2_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);
hen3_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);
hen4_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);
hen5_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);
hen6_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragStart);

function dragStart (event: MouseEvent):void
{
    event.target.startDrag();
}

/*Mouse Event that ensures the function of hen movieclip to drop
when the mouse button is realeased with Condition statement, if
hen = holder, hen snaps into place*/

hen1_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop1);
function dragStop1 (event:MouseEvent):void
{
    hen1_mc.stopDrag();
    if (hen1_mc.hitTestObject (holder1_mc)==true)
       
    {
        hen1_mc.x=holder1_mc.x;
        hen1_mc.y=holder1_mc.y;
    }
}

hen2_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop2);
function dragStop2 (event:MouseEvent):void
{
    hen2_mc.stopDrag();
    if(hen2_mc.hitTestObject (holder2_mc)==true)
    {
        hen2_mc.x=holder2_mc.x;
        hen2_mc.y=holder2_mc.y;
    }
}

hen3_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop3);
function dragStop3 (event:MouseEvent):void
{
    hen3_mc.stopDrag();
    if(hen3_mc.hitTestObject (holder3_mc)==true)
    {
        hen3_mc.x=holder3_mc.x;
        hen3_mc.y=holder3_mc.y;
    }
}

hen4_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop4);
function dragStop4 (event:MouseEvent):void
{
    hen4_mc.stopDrag();
    if(hen4_mc,hitTestObject (holder4_mc)==true)
    {
        hen4_mc.x=holder4_mc.x;
        hen4_mc.y=holder4_mc.y;
    }
}

hen5_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop5);
function dragStop5 (event:MouseEvent):void
{
    hen5_mc.stopDrag();
    if(hen5_mc.hitTestObject (holder5_mc)==true)
    {
        hen5_mc.x=holder5_mc.x;
        hen5_mc.y=holder5_mc.y;
    }
}

hen6_mc.addEventListener(MouseEvent.MOUSE_UP, dragStop6);
function dragStop6 (event:MouseEvent):void
{
    hen6_mc.stopDrag();
    if(hen6_mc.hitTestObject (holder6_mc)==true)
    {
        hen6_mc.x=holder6_mc.x;
        hen6_mc.y=holder6_mc.y;
    }
}