function MM_showHideLayers() { //v9.0
  var i,p,v,obj;
  var args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) 
    with (document)
    if (getElementById && ((obj=getElementById(args[i]))!=null)) {
      v=args[i+2];
      if (obj.style) {
        obj=obj.style;
        v=(v=='show')?'visible':(v=='hide')?'hidden':v;
      }
      obj.visibility=v;
    }
}