public function every_frame(event:Event)
   {
    switch (key_press)
    {
     case 37 :
      tank.x -=  speed;
      tank.rotation = -90;
      break;

     case 38 :
      tank.y -=  speed;
      tank.rotation = 0;
      break;

     case 39 :
      tank.x +=  speed;
      tank.rotation = 90;
      break;

     case 40 :
      tank.y +=  speed;
      tank.rotation = 180;
      break;
    }
   }

var size:uint = 18;
var map:Array = [   
             [1,1,1,1,1,1,1,1,1,1,1,1],   
             [1,0,0,2,1,1,1,1,1,2,0,1],   
             [1,0,0,0,1,1,1,1,1,0,0,1],   
             [1,0,2,0,0,1,1,1,1,0,1,1],   
             [1,0,1,0,0,0,1,2,0,0,0,0],   
             [1,0,0,1,0,0,1,0,0,0,0,0],   
             [1,1,1,1,0,0,1,0,0,1,1,1],   
             [1,0,0,0,0,0,0,0,0,0,0,1],   
             [1,1,1,1,1,1,1,1,1,1,1,1]
             ];

addEventListener(Event.ENTER_FRAME, createmaps);
function createmaps(e:Event)
{
   for (var i:uint=0; i<map.length; i++)
   {
    for (var j:uint=0; j<map[i].length; j++)
    {
     if (map[i][j] > 0)
     {
      var obj:walls = new walls  ;
      obj.x = j * size;
      obj.y = i * size;
      obj.gotoAndStop(map[i][j]);
      addChild(obj);
     }
    }
   }
}

stop();  

var mSpeed=5;

player.onEnterFrame=function() {
if (Key.isDown(Key.LEFT)) this._x -= mSpeed;  
if (Key.isDown(Key.RIGHT)) this._x += mSpeed;  
if (Key.isDown(Key.UP)) this._y -= mSpeed;  
if (Key.isDown(Key.DOWN)) this._y += mSpeed;  
}

import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

stage.addEventListener(KeyboardEvent.KEY_UP, f);
function f(e:KeyboardEvent):void {trace(test);
switch(e.keyCode) {
case Keyboard.RIGHT:
test.x += 10;
break;
case Keyboard.DOWN:
test.y += 10;
break;
case Keyboard.LEFT:
test.x -= 10;
break;
case Keyboard.UP:
test.y -= 10;
break;
}
}