//var isNN = document.layers;
// Note that isNN fails on NN7, so use other.css for NS7
var browserAgent = navigator.userAgent.toLowerCase();
// NN must have mozilla, but none of the others below:
var isNN = (browserAgent.indexOf('mozilla')!=-1) &&
 (browserAgent.indexOf("opera")==-1) &&
 (browserAgent.indexOf('msie')==-1) &&
 (browserAgent.indexOf('spoofer')==-1);
var isIE = (navigator.appVersion.indexOf("MSIE")>0);
var isMac = (navigator.appVersion.indexOf("Mac")!= -1);
var isWin = (navigator.appVersion.indexOf("Win")!= -1);