button_left.addEventListener(MouseEvent.MOUSE_OVER, rollover1);
button_front.addEventListener(MouseEvent.MOUSE_OVER, rollover2);
button_engine.addEventListener(MouseEvent.MOUSE_OVER, rollover3);
button_back.addEventListener(MouseEvent.MOUSE_OVER, rollover4);
button_right.addEventListener(MouseEvent.MOUSE_OVER, rollover5);


// Try: CLICK


function rollover1 (event: MouseEvent):void  {
  mc_left.visible = true;
  mc_front.visible = false;
  mc_engine.visible = false;
  mc_back.visible = false;
  mc_right.visible = false;
}

function rollover2 (event: MouseEvent):void  {
  mc_left.visible = false;
  mc_front.visible = true;
  mc_engine.visible = false;
  mc_back.visible = false;
  mc_right.visible = false;
}

function rollover3 (event: MouseEvent):void  {
  mc_left.visible = false;
  mc_front.visible = false;
  mc_engine.visible = true;
  mc_back.visible = false;
  mc_right.visible = false;
}

function rollover4 (event: MouseEvent):void  {
  mc_left.visible = false;
  mc_front.visible = false;
  mc_engine.visible = false;
  mc_back.visible = true;
  mc_right.visible = false;
}

function rollover5 (event: MouseEvent):void  {
  mc_left.visible = false;
  mc_front.visible = false;
  mc_engine.visible = false;
  mc_back.visible = false;
  mc_right.visible = true;
}