var detect = navigator.userAgent.toLowerCase();
var IE = (detect.indexOf("msie") !=-1);
var NS = (detect.indexOf("compatible") ==-1);
var NS7 = (detect.indexOf("netscape/7") !=-1);
var NS47 = (detect.indexOf("mozilla/4.7") !=-1); //added jf 4/5/2003 to detect NS 4.7