Actionscript 3.0 how to remove or stop movieclip.

this is the coding, can someone spot me what wrong with the code. the picture 2 below show that the link and black button still. i hope someone can help me. im begging

import flash.display.MovieClip;
import flash.events.MouseEvent;

var num_linked:Number = 3;

var stat_line:Boolean = false;
var _stloop:Boolean = false;
var _stdone:Boolean = false;
var num_fra:Number = 0;
var num_loop:Number = 0;
var num_true:Number = 0;
var num_step:Number = 0;

var _loop:MovieClip = new MovieClip();
_loop.addEventListener(Event.ENTER_FRAME,enterLoop);

function start_linked():void
{
var ar_link:Array = [];
for (var i:Number = 1; i <= num_linked; i++)
{
ar_link[i] = true;
if (i >= num_linked)
{
ar_link[0] = false;
set_linked(ar_link);
}
}

var _check:MovieClip = getChildByName("bt_check") as MovieClip;
_check.buttonMode = true;
_check.st = false;
_check.alpha = .2;
_check.addEventListener(MouseEvent.CLICK,clickCheck);

var _refresh:MovieClip = getChildByName("bt_refresh") as MovieClip;
_refresh.buttonMode = true;
_refresh.st = false;
_refresh.alpha = .2;
_refresh.addEventListener(MouseEvent.CLICK,clickRefresh);
}

function randomNumber(_ar:Array):Number
{
var _num:Number = 0;
do
{
_num = Math.floor(Math.random() * (num_linked + 1));
} while (_ar[_num] == false);
return _num;
}

function set_linked(_ar:Array):void
{
var _num:Number;

var _linked:MovieClip;
var _lefted:MovieClip;
var left_drag:MovieClip;
var _righte:MovieClip;
var _express:MovieClip;
for (var i:Number = 1; i <= num_linked; i++)
{
_num = randomNumber(_ar);
_ar[_num] = false;
_linked = getChildByName("link_text"+i) as MovieClip;
_linked.gotoAndStop(_num);

_righte = getChildByName("right"+i) as MovieClip;
_righte.tgt = 0;
_righte.inm = _num;

_lefted = getChildByName("left"+i) as MovieClip;
left_drag = new point_mc();
left_drag.name = "drag" + i;
left_drag.x = _lefted.x;
left_drag.y = _lefted.y;
left_drag.stat = true;
left_drag.icd = i;
left_drag.drg = false;
addChild(left_drag);
left_drag.addEventListener(MouseEvent.MOUSE_DOWN,start_drag);
left_drag.addEventListener(MouseEvent.MOUSE_MOVE,move_drag);
left_drag.addEventListener(MouseEvent.CLICK,click_drag);

_express = new mv_exp();
_express.name = "exp" + i;
_express.gotoAndStop(1);
_express.x = _righte.x + (_righte.width / 2);
_express.y = _righte.y;
_express.visible = false;
addChild(_express);
}
}

function start_drag(e:MouseEvent):void
{
if (e.currentTarget.stat)
{
e.currentTarget.startDrag(true);
stat_line = false;
start_line(e.currentTarget.icd,true);

e.currentTarget.drg = true;
}
}

function start_line(a:Number,b:Boolean):void
{
var _line:MovieClip;
if (stat_line)
{
_line = getChildByName("line"+a) as MovieClip;
removeChild(_line);
stat_line = false;
}
if (b)
{
_line = new MovieClip();
_line.name = "line" + a;
addChild(_line);

var _left:MovieClip = getChildByName("left"+a) as MovieClip;
var left_drag:MovieClip = getChildByName("drag"+a) as MovieClip;
setChildIndex(left_drag,numChildren-1);

_line.graphics.lineStyle(4, 0x000000, .75);
_line.graphics.moveTo(_left.x,_left.y);
_line.graphics.lineTo(left_drag.x,left_drag.y);
stat_line = true;
}
}

function move_drag(e:MouseEvent):void
{
if (e.currentTarget.stat && e.currentTarget.drg)
{
start_line(e.currentTarget.icd,true);
}
}

function click_drag(e:MouseEvent):void
{
if (e.currentTarget.stat)
{
e.currentTarget.stopDrag();
e.currentTarget.drg = false;

var left:MovieClip = getChildByName("left"+e.currentTarget.icd) as MovieClip;
var _line:MovieClip;
for (var i:Number = 1; i <= num_linked; i++)
{
var _right:MovieClip = getChildByName("right"+i) as MovieClip;
if (e.currentTarget.hitTestObject(_right))
{
if (_right.tgt == 0)
{
_right.tgt = e.currentTarget.icd;
e.currentTarget.x = _right.x;
e.currentTarget.y = _right.y;
e.currentTarget.stat = false;
start_line(e.currentTarget.icd,true);
check_placed();
break;
}
}
if (i >= num_linked)
{
e.currentTarget.x = left.x;
e.currentTarget.y = left.y;
start_line(e.currentTarget.icd,false);
break;
}
}
}
}

function check_placed():void
{
var _num:Number = 0;

var _right:MovieClip;
for (var i:Number = 1; i <= num_linked; i++)
{
_right = getChildByName("right"+i) as MovieClip;
if (_right.tgt != 0)
{
_num++;
}
if (i >= num_linked)
{
var _check:MovieClip = getChildByName("bt_check") as MovieClip;
_check.st = false;
_check.alpha = .2;
if (_num >= num_linked)
{
_check.st = true;
_check.alpha = 1;
}
break;
}
}
}

function clickCheck(e:MouseEvent):void
{
if (e.currentTarget.st)
{
e.currentTarget.st = false;
e.currentTarget.alpha = .2;
e.currentTarget.gotoAndStop(1);

num_true = 0;

var _right:MovieClip;
for (var i:Number = 1; i <= num_linked; i++)
{
_right = getChildByName("right"+i) as MovieClip;

var _express:MovieClip = getChildByName("exp"+i) as MovieClip;
setChildIndex(_express,numChildren - 1);
trace(_right.tgt+" - "+_right.inm);
if (_right.tgt == _right.inm)
{
_express.gotoAndStop(1);
num_true++;
}
else
{
_express.gotoAndStop(20);
}
if (i >= num_linked)
{
num_fra = 5;
num_loop = 1;
_stloop = true;
break;
}
}
}
}

function enterLoop(e:Event):void
{
if (_stloop)
{
var _refresh:MovieClip = getChildByName("bt_refresh") as MovieClip;

if (num_fra <= 0)
{
var _express:MovieClip = getChildByName("exp"+num_loop) as MovieClip;
_express.visible = true;
setChildIndex(_express,this.numChildren - 1);
_express.play();
num_loop++;
num_fra = 25;
if (num_loop > num_linked)
{
if (num_true < num_linked)
{
_refresh.alpha = 1;
_refresh.st = true;
}
else
{
_stdone = true;
}
_stloop = false;
}
}
else
{
num_fra--;
}
}
}

function clickRefresh(e:MouseEvent):void
{
if (e.currentTarget.st)
{
e.currentTarget.st = false;
e.currentTarget.alpha = .2;
e.currentTarget.gotoAndStop(1);

num_step++;

var _express:MovieClip;
var left_drag:MovieClip;
for (var i:Number = 1; i <= num_linked; i++)
{
left_drag = getChildByName("drag"+i) as MovieClip;
removeChild(left_drag);

stat_line = true;
start_line(i,false);

_express = getChildByName("exp"+i) as MovieClip;
removeChild(_express);
if (i >= num_linked)
{
start_linked();
break;
}
}
}
}

start_linked();