Changing frames in a class

so i'm working on pretty basic game @ moment. when press down key, want character (at moment, square) slide underneath obstacles. have standing animation 1 frame , sliding within same class, when press down key, switches second frame yet object on first frame remains on top. suspect because created square so:

 

//create square

          var newsquare:number = 1;

          var square:square = new square;

          square.x = 50;

          square.y = 180;

          stage.addchild(square);

 

that it's creating new squares overtop 1 that's sliding. code sliding follows:

 

//slide

          var down:boolean = false;

          stage.addeventlistener(keyboardevent.key_down, _slidedown);

          function _slidedown(e:keyboardevent):void {

                    if (e.keycode == 40) {

                              down = true;

                    }

          }

          stage.addeventlistener(keyboardevent.key_up, _slideup);

          function _slideup(e:keyboardevent):void {

                    if (e.keycode == 40) {

                              down = false;

                    }

          }

          stage.addeventlistener(event.enter_frame, _slide);

          function _slide(e):void {

                    if (down == true) {

                              square.gotoandplay(2);

                    }

                    if (down == false) {

                              square.gotoandplay(1);

                    }

          }

 

if i'm right generating infinite squares, me fix it? tried using conditional , number variable , changing number when square created, didn't help. if i'm not right, other appreciated.

when create things dynamically, not have home in timeline unless make them child of object secured timeline.

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