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; }
}