function MM_showHideLayers() {//v9.0
  var i,p,v,obj,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;}
}