if(dist < minDist)
     {
      graphics.lineStyle(1, 0xffffff, 1 - dist / minDist);
      graphics.moveTo(partA.x, partA.y);
      graphics.lineTo(partB.x, partB.y);
      var ax:Number = dx * springAmount;
      var ay:Number = dy * springAmount;
      partA.vx += ax;
      partA.vy += ay;
      partB.vx -= ax;
      partB.vy -= ay;
     }
    }
   }
  }