function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  if (parseInt(navigator.appVersion) >= 5 ||
navigator.appVersion.indexOf("MSIE 5") != -1) {
     for (i=0;i<args.length-2;i+=3) {
        var item = document.getElementById(args[i]);
        if (args[i+2]=='show') {
           item.style.visibility='visible' }
        else {
           item.style.visibility='hidden'
        }
     }
     return true
  }
  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; }
}