I found the solution myself...and I did K.I.S.S!

just add this code to "ball" MC's enterFrame()
Code:
if(this.hitTest(ball2))
	{
		if(ball._x>ball2._x)
		  {this._x=this._x+1;}
		if(ball._y<ball2._y)
		  {this._y=this._y-1;}
		if(ball._x<ball2._x)
		  {this._x=this._x-1;}
		if(ball._y>ball2._y)
		  {this._y=this._y+1;}  
	}
Regards!