var subMenuList = new Array("sw1","sw2","sw3");

function switchMenu(id){

  switch(id){
    case "sw1":
      document.getElementById(subMenuList[0]).style.display = "block";
      document.getElementById(subMenuList[1]).style.display = "none";
    break;

    case "sw2":
      document.getElementById(subMenuList[0]).style.display = "none";
      document.getElementById(subMenuList[1]).style.display = "block";
    break;

    defalut:
    break;
  }

}