function nextContents(no) {
  if (no==0){
    location.href="index.html";
  }else if (no==1){
    location.href="databaseContents.html";    
  }else if (no==2){
    location.href="mierukaContents.html";
  }else if (no==3){
    location.href="websystemContents.html";
  }else if (no==4){
    location.href="customContents.html";
  }else if (no==5){
    location.href="hpContents.html";
  }else if (no==10){
    location.href="noukiContents.html";
  }else if (no==30){
    location.href="index.html";
  }else if (no==31){
    location.href="siteMap.html";
  }else if (no==50){
    location.href="../index.html";
  }else {//工事中
    alert("工事中です...");
  }
}