Why will neither of my characters jump?

Question

Main.as:
package
  import flash.display.Bitmap;
  import flash.display.Sprite;
  import flash.events.Event;
  import flash.events.KeyboardEvent;
  * @author Harry
  public class Main extends Sprite
  public var FireBoy:Hero;
  public var WaterGirl:Female;
  public var Door1:Firedoor;
  public var Door2:Waterdoor;
  public function Main():void
  if (stage) init();
  else addEventListener(Event.ADDED_TO_STAGE, init);
  private function init(e:Event = null):void
  removeEventListener(Event.ADDED_TO_STAGE, init);
  // entry point
  FireBoy = new Hero ();
  stage.addChild(FireBoy);
  FireBoy.y = 495;
  //This allows movement for FireBoy
  stage.addEventListener(KeyboardEvent.KEY_DOWN, HandleHeroMove);
  WaterGirl = new Female();
  stage.addChild(WaterGirl);
  WaterGirl.x = 70;
  WaterGirl.y = 495;
  stage.addEventListener(KeyboardEvent.KEY_DOWN, HandleFemaleMove);
  Door1 = new Firedoor();
  stage.addChild(Door1);
  Door1.x = 5;
  Door1.y = 62;
  Door2 = new Waterdoor();
  stage.addChild(Door2);
  Door2.x = 100;
  Door2.y = 62;
  graphics.beginFill(0x804000, 1);
  graphics.drawRect(0, 0, 800, 40);
  graphics.endFill();
  graphics.beginFill(0x804000, 1);
  graphics.drawRect(0, 170, 600, 40);
  graphics.endFill();
  graphics.beginFill(0x804000, 1);
  graphics.moveTo(800, 200);
  graphics.lineTo(800, 700);
  graphics.lineTo(400, 700);
  graphics.lineTo(100, 700);
  graphics.endFill();
  graphics.beginFill(0x804000, 1);
  graphics.drawRect(0, 580, 800, 40);
  graphics.endFill();
  //This handles FireBoys movement
  public function HandleHeroMove(e:KeyboardEvent):void
  trace(e.keyCode);
  //This is for moving to the left
  if (e.keyCode == 37)
  FireBoy.x = FireBoy.x - 30;
  Check_Border();
  //This is for moving to the right
  else if (e.keyCode == 39)
  FireBoy.x = FireBoy.x + 30;
  Check_Border();
  else if (e.keyCode == 38)
  FireBoy.grav = -15;
  //This handles WaterGirls movement
  public function HandleFemaleMove (e:KeyboardEvent):void
  trace(e.keyCode);
  //This is for moving to the left
  if (e.keyCode == 65)
  WaterGirl.x = WaterGirl.x - 30;
  Check_Border();
  //This is for moving to the right
  else if (e.keyCode == 68)
  WaterGirl.x = WaterGirl.x + 30;
  Check_Border();
  else if (e.keyCode == 87)
  WaterGirl.grav = -15;
  //This stops characters from leaving the screen
  public function Check_Border():void
  if (FireBoy.x <= 0)
  FireBoy.x = 0;
  else if (FireBoy.x > 750)
  FireBoy.x = 750;
  if (WaterGirl.x <= 0)
  WaterGirl.x = 0;
  else if (WaterGirl.x > 750)
  WaterGirl.x = 750;
Hero.as:
package 
  import flash.display.Bitmap;
  import flash.display.Sprite;
  * @author Harry
  public class Hero extends Sprite
  [Embed(source="../assets/FireBoy.jpg")]
  private static const HeroFireBoy:Class;
  private var FireBoy:Bitmap;
  public var grav:int = 0;
  public var floor:int = 580;
  public function Hero()
  FireBoy = new Hero.HeroFireBoy();
  scaleX = 0.1;
  scaleY = 0.1;
  addChild(FireBoy);
  public function adjust():void
  FireBoy.y += grav;
  if(FireBoy.y+FireBoy.height/2<floor)
  grav++;
  else
  grav = 0;
  FireBoy.y = floor - FireBoy.height / 2;
  if (FireBoy.x - FireBoy.width / 2 < 0)
  FireBoy.x = FireBoy.width / 2;
  if (FireBoy.x + FireBoy.width / 2 > 800)
  FireBoy.x = 800 - FireBoy.width / 2;
Female.as:
package 
  import flash.display.Bitmap;
  import flash.display.Sprite;
  * @author Harry
  public class Female extends Sprite
  [Embed(source = "../assets/WaterGirl.png")]
  private static const FemaleWaterGirl:Class;
  private var WaterGirl:Bitmap;
  public var grav:int = 0;
  public var floor:int = 580;
  public function Female()
  WaterGirl = new Female.FemaleWaterGirl();
  scaleX = 0.1;
  scaleY = 0.1;
  addChild(WaterGirl);
  public function adjust():void
  WaterGirl.y += grav;
  if(WaterGirl.y+WaterGirl.height/2<floor)
  grav++;
  else
  grav = 0;
  WaterGirl.y = floor - WaterGirl.height / 2;
  if (WaterGirl.x - WaterGirl.width / 2 < 0)
  WaterGirl.x = WaterGirl.width / 2;
  if (WaterGirl.x + WaterGirl.width / 2 > 800)
  WaterGirl.x = 800 - WaterGirl.width / 2;

Answer 1

usually something in your handlemove functions where you decrease a characters y property.