NS4 = (document.layers);
     IE4 = (document.all);
    ver4 = (NS4 || IE4);
     IE5 = (IE4 && navigator.appVersion.indexOf("5.")!=-1);
   isMac = (navigator.appVersion.indexOf("Mac") != -1);
  isMenu = (NS4 || (IE4 && !isMac) || (IE5 && isMac));

function popUp(){return};
function popDown(){return};

if (!ver4) event = null;