「Line２７１〜２８１」

  if (!LayerBeing[number] && 
          IdName != "LOADING_MSG" ) return;

  var IE_In = "none" , NS_In = "HIDE" ;
  if (power){ IE_In = "block"; NS_In = "SHOW"; }

  if (isIE5 || isIE6 || isNS6){
    el = document.getElementById(IdName);
    el.style.display = IE_In;
  } else if(isNS4) {
    document.layers[IdName].visibility = NS_In;
  }