How can I turn this Script into a Behavior?

Hello. I would like some help on this. I've been trying to turn this script into a behavior, but I'm not able. Can you please help? I've added the behavior header, but it doesn't work. What must i do?

function playerClass::onLevelLoaded(%this, %scenegraph)
{
$player = %this;

moveMap.bindCmd(keyboard, "left", "playerLeft();", "playerLeftStop();");
moveMap.bindCmd(keyboard, "right", "playerRight();", "playerRightStop();");
moveMap.bindCmd(keyboard, "space", "playerJump();", "");
}

function playerLeft()
{
$player.moveLeft = true;
}

function playerLeftStop()
{
$player.moveLeft = false;
}

function playerRight()
{
$player.moveRight = true;
}

function playerRightStop()
{
$player.moveRight = false;
}

function playerJump()
{
if(!$player.airborne)
{
$player.setLinearVelocityY(-200);
$player.airborne = true;
}
}


function playerClass::updateHorizontal(%this)
{
if(%this.moveLeft)
{
%this.setLinearVelocityX(-300);
}

if(%this.moveRight)
{
%this.setLinearVelocityX(300);
}

if(!%this.moveLeft && !%this.moveRight)
{
%this.setLinearVelocityX(0);
}
}

function playerClass::updateVertical(%this)
{
%yVelocity = %this.getLinearVelocityY();

%this.setLinearVelocityY(10);
%collision = %this.castCollision(0.005);

%normalX = getWord(%collision, 4);
%normalY = getWord(%collision, 5);

// no collision
if (%collision $= "")
{
%this.airborne = true;
%this.setConstantForceY(350);
%this.setLinearVelocityY(%yVelocity);
return;
}

// collides with wall to the left
if (%normalX == 1 && %normalY == 0)
{
%this.againstLeftWall = true;
%this.setLinearVelocityX(0);
%this.setLinearVelocityY(%yVelocity);

if(isModifierKey("Space")
{
%this.setLinearVelocityY(-300);
}
return;
}

// collides with wall to the right
if (%normalX == -1 && %normalY == 0)
{
%this.againstRightWall = true;
%this.setLinearVelocityX(0);
%this.setLinearVelocityY(%yVelocity);

if(isModifierKey("Space")
{
%this.setLinearVelocityY(-300);
}

return;
}

// on ground with no wall collisions
if (%normalX == 0 && %normalY == -1)
{
%this.jump=false;
%this.airborne = false;
%this.againstLeftWall = false;
%this.againstRightWall = false;
%this.setConstantForceY(0);
%this.setLinearVelocityY(%yVelocity);
return;
}

// in air and hits platform with head
if (%normalY == 1)
{
%this.airborne = true;
%this.setLinearVelocityX(0);
%this.setConstantForceY(100);
%this.setLinearVelocityY(%yVelocity);
return;
}

// in case another type of collision normal was detected
error("another collison type" SPC %normalX SPC %normalY);
%this.airborne = false;
%this.againstLeftWall = false;
%this.againstRightWall = false;
%this.setLinearVelocityY(%yVelocity);
}

function playerClass::setCurrentAnimation(%this)
{
%xVelocity = %this.getLinearVelocityX();
%yVelocity = %this.getLinearVelocityY();

if (%xVelocity > 0)
{
%this.setFlip(false, false);
}
else if (%xVelocity < 0)
{
%this.setFlip(true, false);
}

if ($player.moveLeft == true || $player.moveRight == true)
{
if (%this.getAnimationName() $= "PlayerAnimation")
{
if(%this.getIsAnimationFinished())
{
%this.playAnimation(PlayerAnimation);
//%this.playAnimation(PlayerAnimation);
return;
}
}else
{
%this.playAnimation(PlayerAnimation);
}
}
else
{
%this.playAnimation(PlayerStand);
}


if (%this.airborne)
{
if(%yVelocity < 0)
{
%this.playAnimation(PlayerJumpUp);
return;
}else
{
%this.playAnimation(PlayerJumpDown);
return;
}
}
}


function PlatformerSceneGraph::onUpdateScene()
{
if (isObject($player))
$player.updateMovement();
}

function playerClass::updateMovement(%this)
{
%this.updateHorizontal();
%this.updateVertical();
%this.setCurrentAnimation();

}