function menu1(){
  
    document.location.href = "intro.html";
  
  }
  function menu2(){
  
    document.location.href = "pro_1.html";
  
  }
  function menu2sub1(){
  
    document.location.href = "pro_1.html";
  
  }
  function menu2sub2(){
  
    document.location.href = "pro_3.html";
  
  }
  
  function menu3(){
  
    document.location.href = "product_car.html";
  
  }
  function menu3sub1(){
  
    document.location.href = "product_car.html";
  
  }
  function menu3sub2(){
  
    document.location.href = "product_moto.html";
  
  }
  function menu3sub3(){
  
    document.location.href = "product_deco.html";
  
  }
  function menu4(){
  
    document.location.href = "quality_1.html";
  
  }
  function menu4sub1(){
  
    document.location.href = "quality_1.html";
  
  }
  function menu4sub2(){
  
    document.location.href = "quality_2.html";
  
  }
  function menu5(){
  
    document.location.href = "relative.html";
  
  }
  function menu6(){
  
    document.location.href = "caigibbs/zboard.php?id=bulletin";
  
  }