Prototype of a Flash game like Meeblings

package {
	import flash.display.Sprite;
	import flash.events.Event;
	import Box2D.Dynamics.*;
	import Box2D.Collision.*;
	import Box2D.Collision.Shapes.*;
	import Box2D.Common.Math.*;
	import flash.events.MouseEvent;
	public class HelloWorld extends Sprite {
		var body:b2Body;
		var magnet:Boolean=false;
		public function HelloWorld() {
			addEventListener(Event.ENTER_FRAME, Update, false, 0, true);
			var worldAABB:b2AABB = new b2AABB();
			worldAABB.lowerBound.Set(-100.0, -100.0);
			worldAABB.upperBound.Set(100.0, 100.0);
			var gravity:b2Vec2=new b2Vec2(0.0,10.0);
			var doSleep:Boolean=true;
			m_world=new b2World(worldAABB,gravity,doSleep);
			var m_sprite:Sprite;
			m_sprite = new Sprite();
			addChild(m_sprite);
			var dbgDraw:b2DebugDraw = new b2DebugDraw();
			var dbgSprite:Sprite = new Sprite();
			m_sprite.addChild(dbgSprite);
			dbgDraw.m_sprite=m_sprite;
			dbgDraw.m_drawScale=30;
			dbgDraw.m_alpha=1;
			dbgDraw.m_fillAlpha=0.5;
			dbgDraw.m_lineThickness=1;
			dbgDraw.m_drawFlags=b2DebugDraw.e_shapeBit;
			m_world.SetDebugDraw(dbgDraw);
			var bodyDef:b2BodyDef;
			var boxDef:b2PolygonDef;
			var circleDef:b2CircleDef;
			bodyDef = new b2BodyDef();
			bodyDef.position.Set(8, 14);
			boxDef = new b2PolygonDef();
			boxDef.SetAsBox(80, 1);
			boxDef.friction=0.3;
			boxDef.density=0;
			body=m_world.CreateBody(bodyDef);
			body.CreateShape(boxDef);
			body.SetMassFromShapes();
			for (var i:int = 1; i <= 10; i++) {
				bodyDef = new b2BodyDef();
				bodyDef.position.x=Math.random()*12+2;
				bodyDef.position.y=Math.random()*5;
				circleDef = new b2CircleDef();
				circleDef.radius=Math.random()/2+0.2;
				circleDef.density=1.0;
				circleDef.friction=0.5;
				circleDef.restitution=0.2;
				body=m_world.CreateBody(bodyDef);
				body.CreateShape(circleDef);
				body.SetMassFromShapes();
			}
			stage.addEventListener(MouseEvent.MOUSE_DOWN, createMouse);
			stage.addEventListener(MouseEvent.MOUSE_UP, destroyMouse);
		}
		public function createMouse(evt:MouseEvent):void {
			magnet=true;
		}
		public function destroyMouse(evt:MouseEvent):void {
			magnet=false;
		}
		public function Update(e:Event):void {
			var dist_x;
			var dist_y;
			var distance;
			m_world.Step(m_timeStep, m_iterations);
			if (magnet) {
				for (var bb:b2Body = m_world.m_bodyList; bb; bb = bb.m_next) {
					dist_x=mouseX/30-bb.GetPosition().x;
					dist_y=mouseY/30-bb.GetPosition().y;
					distance = dist_x*dist_x+dist_y*dist_y;
					if (distance<16) {
						bb.ApplyImpulse(new b2Vec2(dist_x/20, dist_y/5),bb.GetWorldCenter());
					}
				}
			}
		}
		public var m_world:b2World;
		public var m_iterations:int=10;
		public var m_timeStep:Number=1.0/30.0;
	}
}