isDOM = (document.getElementById) ? true : false;
 isNS4 = (document.layers) ? true : false;
  isIE = (document.all) ? true : false;
 isIE4 = isIE && !isDOM;
 isMac = (navigator.appVersion.indexOf("Mac") != -1);
//noSite = (isNS4 || ((navigator.appVersion.indexOf("Mac")) && !isDOM) || !isDOM);