function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;

  for (i=0; i<(args.length-2); i+=3)
    if ((obj=MM_findObj(args[i]))!=null) {
      v=args[i+2];
      if (obj.style) {
        obj=obj.style;
        v=(v=='show')?'visible':(v=='hide')?'hidden':v;
      }
      obj.visibility=v;
    }
}