NS4 = (document.layers);
     IE4 = (document.all);
    ver4 = (NS4 || IE4);
	 IE5 = (IE4 && navigator.appVersion.indexOf("5.")!=-1);
   isMac = (navigator.appVersion.indexOf("Mac") != -1);
   
   if (NS4 || IE4 || (IE5 && !isMac)) {
   isMenu = (NS4 || IE4 || (IE5 && !isMac));
  }
  else {
  isMenu = (IE5 && isMac);
  }
  
function popUp(){return};
function popDown(){return};
if (!ver4) event=null;