How object can travell on other objects?

Question

I want create game. In game will player. And this player must go on blue boxes(so, player can go to left, right and jump). How i can do it?:)
Also attached picture and files.
code:
package code{
     import flash.events.Event;
     import flash.events.*;
     import flash.events.KeyboardEvent;
     import flash.display.MovieClip;
     import flash.display.*;
     import flash.ui.Keyboard;
     import flash.utils.*;
     public class Travelling extends MovieClip
          // Properties:
          public var left:Boolean=false;
          public var right:Boolean=false;
          public var jump:Boolean=false;
          // Animation
          public var speed:Number=15;
          // Constructor:
          public function Travelling()
               // Listen to keyboard presses
               stage.addEventListener(KeyboardEvent.KEY_DOWN,keyPressHandler);
               stage.addEventListener(KeyboardEvent.KEY_UP,keyReleaseHandler);
               // Update screen every frame
               addEventListener(Event.ENTER_FRAME,enterFrameHandler);
               my_fps.text = String(stage.frameRate);
               my_points.text = "0";
          // Event Handling:
          protected function enterFrameHandler(event:Event):void
               var points:Number = 0;
               // Move left, right, jump
               if (jump && ! right && ! left)
                    trace("jump");
               if (left&&! right) {
                    trace("go to left");
                    player_mc.x-=speed;
                    player_mc.scaleX=-1;
                    if (player_mc.x-player_mc.height/2<warField_mc.x) {
                         player_mc.x = warField_mc.x + player_mc.height / 2;
                         player_mc.gotoAndStop(1);
               if (right&&! left) {
                    trace("go to right");
                    player_mc.x+=speed;
                    player_mc.scaleX=1;
                    if (player_mc.x+player_mc.height/2>warField_mc.width) {
                         player_mc.x = warField_mc.width - player_mc.height / 2;
                         player_mc.gotoAndStop(1);
               function hideBlood() {
                    blood_mc.visible=false;
               if (player_mc.hitTestObject(enemy_mc)) {
                    enemy_mc.visible=false;
                    blood_mc.x=enemy_mc.x;
                    blood_mc.y=enemy_mc.y;
                    setTimeout(hideBlood, 1000);
                    points += 100;
                    my_points.text = String(points);
          protected function keyPressHandler(event:KeyboardEvent):void {
               trace(event.keyCode);//in output  you can find number of key;)
               switch (event.keyCode) {
                    case Keyboard.UP :
                         jump=true;
                         player_mc.gotoAndStop(3);
                         break;
                    case Keyboard.LEFT :
                         left=true;
                         player_mc.gotoAndStop(2);
                         break;
                    case Keyboard.RIGHT :
                         right=true;
                         player_mc.gotoAndStop(2);
                         break;
          protected function keyReleaseHandler(event:KeyboardEvent):void {
               switch (event.keyCode) {
                    case Keyboard.UP :
                         jump=false;
                         player_mc.gotoAndStop(1);
                         break;
                    case Keyboard.LEFT :
                         left=false;
                         player_mc.gotoAndStop(1);
                         break;
                    case Keyboard.RIGHT :
                         right=false;
                         player_mc.gotoAndStop(1);
                         break;

Answer 1

you'll need to use a hittestobject to determine if your player is encountering a blue box and needs to change his y property.