function treeFunc(id,id2) {
  if (!document.getElementsByTagName) {
    return false;
  }
  var obj = document.getElementById(id);
  var obj2 = document.getElementById(id2);
  var name;

  // ブラウザ判定
  if (typeof obj2.textContent != "undefined") {
    name = obj2.textContent;
  } else {
    name = obj2.innerText;
  }
  if (obj.style.display == "block" || obj.style.display.length == 0) {
    obj.style.display = "none";
    if (name.indexOf(" ") != -1) {
      var index = name.indexOf(" ");
      name = name.substring(0,index+1);
      name = name + "▽";
    }
  } else {
  obj.style.display = "block";
  if (name.indexOf(" ") != -1) {
    var index = name.indexOf(" ");
    name = name.substring(0,index+1);
    name = name + "△";
  }
}
 // ブラウザ判定
 if (typeof obj2.textContent != "undefined") {
  obj2.textContent = name;
 } else {
  obj2.innerText = name;
 }
 return false;
}