isNN4 = (navigator.appVersion.charAt(0)>=4 && (navigator.appName).indexOf("Netscape") != -1);
  isIE4 = (navigator.appVersion.charAt(0)>=4 && (navigator.appVersion).indexOf("MSIE") != -1);
  
  if(navigator.appVersion.charAt(0) <= 3) {
    event = new Object;
  }
  
  var trDown = new Image();
  var trUp = new Image();
  trDown.src = "images/triDown.gif";
  trUp.src = "images/triUp.gif";
  MaxMenew = 3; //親メニューの数
  LayerHeight = new Array(50,40,30);//サブメニューの高さ(NNで必要,最後のメニュー分はホントはいらない)
  

  function expandIt(index) {
    imName='imel'+index;//画像名
    lyName='Nel'+index;//NN用サブメニューレイヤー
    plyName='Pel'+index;//NN用親メニューレイヤー

    //NN用表示・非表示処理
    if (isNN4 == true ){
      if (document.layers[lyName].hidden==true){
        document.layers[lyName].visibility="show";
        document.layers[plyName].document.images[imName].src = trUp.src; 
        j=1;
      }
      else{
        document.layers[lyName].visibility="hide";
        document.layers[plyName].document.images[imName].src = trDown.src; 
        j=-1;
      }
      //選択したメニュー以降のレイヤーの位置変更
      for (i=index+1;i<(MaxMenew+1);i++){
        lyName  = 'Nel'+i;
        plyName = 'Pel'+i;
        document.layers[plyName].top=document.layers[plyName].top+j*LayerHeight[index-1];
        document.layers[lyName].top=document.layers[lyName].top+j*LayerHeight[index-1];
      }
    }

    //IE用表示・非表示処理
    if (isIE4 == true){
      if (eval('el'+index).style.display == "none") {
        eval('el'+index).style.display = "";
        document.images[imName].src = trUp.src; 
      }
      else {
        eval('el'+index).style.display = "none";
        document.images[imName].src = trDown.src; 
      }
    }
  }